Have you ever wondered how the length of a rectangle can be increased by 30 percent? In this article, we will delve into the fascinating world of **rectilinear figures** and explore the calculation of percentage increase in the length of a rectangle.

- The percent change in the area of a rectangle can be used to determine the percentage increase in its length.
- By using the formulas for the original and new length and width, one can calculate the percent change in the area.
- The percent change in the area is not an increase of 30 percent, but rather a decrease of 9 percent.
- Understanding how to calculate the percentage increase in the length of a rectangle can have practical applications in various scenarios.
**Rectilinear figures**are an important concept in geometry and understanding their properties is crucial in determining percentage increase in length.

## Understanding Rectilinear Figures

Before we dive into the calculation of the percentage increase in the length of a rectangle, it’s important to have a clear understanding of what **rectilinear figures** are. Rectilinear figures are geometric shapes composed of straight lines. These figures include rectangles, squares, parallelograms, and more. In essence, any shape that can be formed by connecting straight line segments can be considered a rectilinear figure.

Rectilinear figures have unique properties that distinguish them from other geometric shapes. One key property is that their angles can only be 90 degrees or multiples of 90 degrees. This means that the lines that form the sides of rectilinear figures intersect at right angles. Another important property is that the opposite sides of rectilinear figures are parallel and congruent, making them equal in length.

In summary, rectilinear figures are geometric shapes made up of straight lines that intersect at right angles. Understanding the properties of rectilinear figures is crucial for calculating the percentage increase in the length of a rectangle and other related calculations. Now that we have a solid foundation, let’s explore how to calculate the percentage increase specifically for rectangles.

## Exploring Percentage Increase in Rectangle Length

Now that we have a good grasp of rectilinear figures, let’s explore how to calculate the percentage increase in the length of a rectangle. To do this, we need to understand the formula and process involved.

The formula for calculating the percentage increase in rectangle length is:

Percentage Increase = [(New Length – Original Length) / Original Length] * 100

Let’s break it down step by step. First, subtract the original length of the rectangle from the new length. Then, divide the result by the original length. Finally, multiply the quotient by 100 to get the percentage increase.

It’s important to note that the resulting percentage change represents the increase in length, not the new length itself. In other words, if the percentage increase is 30 percent, the new length of the rectangle is actually 9 percent larger than the original length.

Now that we have a clear understanding of the formula and process, we can apply it to real-life scenarios and solve various problems related to calculating the percentage increase in the length of a rectangle.

### Example Calculation:

Let’s say we have a rectangle with an original length of 10 units. After an increase of 30 percent, we want to find the new length. Using the formula, we can calculate the percentage increase:

- Percentage Increase = [(New Length – Original Length) / Original Length] * 100
- 30 = [(New Length – 10) / 10] * 100
- (New Length – 10) / 10 = 0.3
- New Length – 10 = 0.3 * 10
- New Length – 10 = 3
- New Length = 3 + 10 = 13

Therefore, the new length of the rectangle is 13 units, representing a 30 percent increase from the original length of 10 units.

By understanding and applying the formula, you can easily calculate the percentage increase in the length of a rectangle, providing valuable insights into changes in dimensions and proportions.

## The Original Length and Width of the Rectangle

To calculate the percentage increase in the length of a rectangle, we need to start with the original length and width of the shape. These values are crucial in determining the extent of the increase and understanding the resulting changes in the figure’s dimensions.

For example, let’s consider a rectangle with an original length of 10 units and an original width of 5 units. To visualize this, refer to the diagram below:

Using these original dimensions, we can now proceed to calculate the percentage increase in the length of the rectangle. By applying the appropriate formulas and plugging in the values, we can determine the extent of the change and its impact on the overall shape of the figure.

Original Length | Original Width |
---|---|

10 units | 5 units |

### Summary:

- Start by determining the original length and width of the rectangle.
- These values form the basis for calculating the percentage increase in the length of the shape.
- In our example, the original length is 10 units, and the original width is 5 units.
- By using these values, we can proceed to calculate the extent of the increase and understand its implications on the figure.

## The New Length and Width after the Increase

Once we have identified the original length and width, we can move on to determining the new dimensions of the rectangle after the increase. Calculating the percentage increase in the length of a rectangle is crucial in understanding its overall transformation. By plugging in the values into the appropriate formulas, we can solve for the new length and width.

Let’s consider an example for clarity. Suppose the original length of a rectangle is 10 units and the width is 5 units. If the length is increased by 30 percent, we need to calculate the new dimensions. To do this, we can use the formula:

New Length = Original Length + (Original Length x Percentage Increase)

Plugging in the values from our example, the new length would be:

New Length = 10 + (10 x 0.3) = 13

Similarly, we can calculate the new width using the same concept. Once we have the new length and width, we can determine the overall transformation of the rectangle and understand the impact of the percentage increase.

Original Length | Original Width | New Length | New Width |
---|---|---|---|

10 units | 5 units | 13 units | 5 units |

In the example above, we can see that the original length and width of the rectangle are 10 units and 5 units, respectively. After increasing the length by 30 percent, the new length becomes 13 units while the width remains the same. It is important to note that the percentage increase in the length of the rectangle does not directly correspond to a 30 percent increase in the overall area. In this case, the percent change in the area is a decrease of 9 percent, showcasing the complex relationship between dimensions and the resulting transformations.

## Plugging in Values and Solving Equations

With all the necessary values at our disposal, we can now proceed to plug them into the equations and solve for the percentage change in the length of the rectangle. Let’s start by reviewing the formulas:

Original Length (L_{1}) = [insert formula here]

Original Width (W_{1}) = [insert formula here]

New Length (L_{2}) = [insert formula here]

New Width (W_{2}) = [insert formula here]

Using these formulas, we can calculate the values for each variable based on the specific rectangle in question. Once we have substituted the values into the formulas, we can proceed with solving the equations to find the percentage change.

It is important to remember that the percentage change in the length of the rectangle is calculated as follows:

Percentage Change = ((L

_{2}– L_{1}) / L_{1}) x 100

We can now substitute the values we have obtained into this equation and calculate the percentage change. Let’s consider an example:

- The original length (L
_{1}) of the rectangle is 10 units. - The original width (W
_{1}) of the rectangle is 5 units. - The new length (L
_{2}) after the increase is 13 units. - The new width (W
_{2}) remains the same at 5 units.

By plugging in these values into the equation, we can calculate the percentage change in the length of the rectangle. After solving the equation, we find that the percentage change is 30 percent.

Original Length (L_{1}) | Original Width (W_{1}) | New Length (L_{2}) | New Width (W_{2}) | Percentage Change in Length |
---|---|---|---|---|

10 units | 5 units | 13 units | 5 units | 30% |

## Understanding the Percent Change

Before we reveal the percentage increase in the length of the rectangle, let’s take a moment to understand the concept of percent change. Percent change is a measure of the relative difference between two quantities expressed as a percentage. In the context of the rectangle’s length increase, it refers to the change in the area resulting from the change in length.

To calculate the percent change in the area of the rectangle, we need to compare the original area with the new area after the increase. The original area is determined by multiplying the original length by the original width. Similarly, the new area can be found by multiplying the new length by the new width. By subtracting the original area from the new area, we obtain the change in area.

Now, let’s take a look at an example to illustrate the process. Consider a rectangle with an original length of 10 units and an original width of 5 units. After increasing the length by 30 percent, the new length becomes 13 units. The new width remains the same at 5 units. Plugging these values into the area formulas, we find that the original area is 50 square units and the new area is 65 square units. Subtracting the original area from the new area gives us a change of 15 square units. To find the percent change, we divide the change by the original area (15/50) and multiply by 100 to get an overall percent change of 30 percent. However, it’s important to note that this percent change represents a decrease in area, not an increase in length.

Original Length | Original Width | New Length | New Width | Original Area | New Area | Change in Area | Percent Change |
---|---|---|---|---|---|---|---|

10 units | 5 units | 13 units | 5 units | 50 square units | 65 square units | 15 square units | 30% |

So, when calculating the percentage increase in the length of a rectangle, we must be careful to consider the resulting percent change in the area. As seen in the example, the length increase of 30 percent leads to a decrease in area of 9 percent. This highlights the importance of understanding the concept of percent change in accurately interpreting the impact of changes in length on rectilinear figures.

## Determining the Percent Change in the Area

As we calculate the percentage increase in the length of the rectangle, it’s important to consider the impact on the area of the shape. To determine the percent change in the area, we need to understand the formulas for both the original and new length and width of the rectangle.

The formula for the area of a rectangle is *length x width*. In this case, let’s assume that the original length is 10 units and the original width is 5 units. The area of the rectangle can be calculated as follows:

Original Length | Original Width | Area |
---|---|---|

10 units | 5 units | 10 x 5 = 50 square units |

Now, let’s consider the new length of the rectangle after the 30 percent increase. Assuming the new length is 13 units and the width remains the same at 5 units, the area can be calculated as follows:

New Length | Original Width | Area |
---|---|---|

13 units | 5 units | 13 x 5 = 65 square units |

By comparing the two areas, we can determine the percent change. In this case, the percent change in the area is a decrease of 9 percent, not an increase of 30 percent as some might assume. It is crucial to be aware of this distinction when calculating the percentage increase in the length of a rectangle.

- Original Length: 10 units
- Original Width: 5 units
- Area: 10 x 5 = 50 square units

- New Length: 13 units
- Original Width: 5 units
- Area: 13 x 5 = 65 square units

By comparing the two areas, we can determine that the percent change in the area is a decrease of 9 percent, not an increase of 30 percent.

Understanding the impact of percentage increase on the area of a rectangle is essential for accurately calculating and interpreting changes in its dimensions. It highlights the need to consider both length and width when determining the percent change in the area. By following the formulas and plugging in the appropriate values, we can ensure accurate results and a better understanding of the overall shape.

## Exploring the Impact of Percentage Increase

Now that we have determined the percent change in the length of the rectangle, let’s explore the real-world implications of this increase. Understanding how to calculate the percentage increase in the length of a rectangle provides valuable insights into the effects it can have on the shape and proportions of the figure.

When the length of a rectangle increases by a certain percentage, the overall area of the shape undergoes a corresponding change. In the case of a 30 percent increase in length, the percent change in the area is actually a decrease of 9 percent. This means that despite the length increasing, the area of the rectangle decreases due to the change in proportions.

To visualize this concept, consider a rectangular garden with an original length of 10 meters and a width of 5 meters. If the length is then increased by 30 percent, the new length becomes 13 meters. However, the new width remains the same. As a result, the area of the rectangle decreases from 50 square meters to 45.5 square meters, reflecting a 9 percent decrease.

Original Length | Original Width | Original Area | New Length | New Width | New Area | Percent Change in Area |
---|---|---|---|---|---|---|

10 meters | 5 meters | 50 square meters | 13 meters | 5 meters | 45.5 square meters | -9% |

This example illustrates how a percentage increase in the length of a rectangle can lead to a decrease in the area. It highlights the importance of considering not just the change in length, but also the overall impact on the shape’s dimensions. Calculating the percentage change in the area helps provide a comprehensive understanding of the transformation the rectangle undergoes.

In conclusion, calculating the percentage increase in the length of a rectangle allows us to analyze the effects it has on the overall shape. By understanding the percent change in the area, we can see the true impact of the length increase. This knowledge is essential in various real-world scenarios, such as construction, design, and geometry, where precise measurements and proportions are crucial.

## Applying the Knowledge

To solidify your understanding of percentage increase in the length of a rectangle, let’s apply this knowledge to some real-life scenarios. Imagine you have a rectangular garden that measures 10 meters in length and 5 meters in width. You decide to increase the length of the garden by 30 percent to accommodate more plants. To determine the new dimensions and the impact on the area, we can use the formulas and steps discussed earlier.

By plugging in the values for the original length and width (10 meters and 5 meters, respectively) into the formulas, we can calculate the new length and width. After increasing the length by 30 percent, the new length becomes 13 meters, and the width remains the same at 5 meters. Now, let’s calculate the percent change in the area of the garden.

Using the formula for the area of a rectangle (length multiplied by width), we find that the original area is 50 square meters. After increasing the length by 30 percent, the new area becomes 65 square meters. To determine the percent change, we subtract the original area from the new area (65 – 50 = 15) and divide the result by the original area (15 ÷ 50 = 0.3). Multiplying this result by 100 gives us a percent change of 30 percent. However, it’s crucial to note that this percent change represents a decrease, not an increase, as the area has increased by 30 percent.

Original | New | Percent Change | |
---|---|---|---|

Length (m) | 10 | 13 | |

Width (m) | 5 | 5 | |

Area (m^{2}) | 50 | 65 | -30% |

As illustrated in the table above, the new length of the garden is 13 meters, while the width remains unchanged at 5 meters. The percent change in the area is -30 percent, indicating an increase in the area. This scenario showcases the practical application of calculating percentage increase in the length of a rectangle and highlights the importance of understanding the concepts to accurately assess changes in dimensions and areas.

Let’s consider another real-life example to further reinforce the concept. Imagine you have a rectangular room that measures 8 feet in length and 6 feet in width. To create more space, you decide to increase the length of the room by 30 percent. Applying the same steps as before, we can calculate the new dimensions and the percent change in the room’s area.

By plugging in the values for the original length and width (8 feet and 6 feet, respectively) into the formulas, we find that the new length becomes 10.4 feet, and the width remains 6 feet. To determine the percent change in the area, we use the area formula and find that the original area is 48 square feet. After increasing the length by 30 percent, the new area becomes 62.4 square feet. Subtracting the original area from the new area gives us 14.4 square feet, and dividing this value by the original area results in a percent change of 30 percent. Again, it’s important to note that this percent change represents an increase in the area.

Original | New | Percent Change | |
---|---|---|---|

Length (ft) | 8 | 10.4 | |

Width (ft) | 6 | 6 | |

Area (ft^{2}) | 48 | 62.4 | +30% |

In this example, the new length of the room is 10.4 feet, while the width remains unchanged at 6 feet. The percent change in the area is +30 percent, indicating an increase in the room’s size. This practical scenario demonstrates how calculating percentage increase in the length of a rectangle can be applied to real-life situations, allowing us to make informed decisions when modifying dimensions or assessing spatial changes.

## Conclusion

Congratulations! You now have a solid understanding of how a rectangle’s length can increase by a specific percentage. By calculating the percent change in the area of the rectangle, you can determine the impact of the increase and gain valuable insights into the dimensions and proportions of the shape.

To calculate the percent change, you need to consider the original length and width of the rectangle, as well as the new length and width after the increase. By plugging in these values and solving the equations, you can find the percent change in the area. It’s important to note that the percent change is actually a decrease of 9 percent, not an increase of 30 percent.

Understanding the concept of percentage increase and decrease in the context of a rectangle’s length is crucial for various applications. Whether you’re working on architectural designs, construction projects, or even everyday calculations, knowing how to calculate the percentage increase in the length of a rectangle can help you make informed decisions and accurately determine the impact of any changes.

Now that you have this knowledge, you can confidently apply it in real-world scenarios. The examples and exercises provided in this article can help you further practice and strengthen your understanding. Remember, practice makes perfect, and the more you work with these calculations, the more comfortable you will become in applying them.

## FAQ

### How can a rectangle’s length increase by 30 percent?

To understand how a rectangle’s length can increase by 30 percent, one must calculate the percent change in the area of the rectangle. This can be done by using the formulas for the original length and width of the rectangle, as well as the formulas for the new length and width after the increase. By plugging in the values and solving the equations, one can determine the percent change in the area. It is important to note that the percent change is a decrease of 9 percent, not an increase of 30 percent.

## Source Links

- https://www.algebra.com/algebra/homework/Percentage-and-ratio-word-problems/Percentage-and-ratio-word-problems.faq.question.450566.html
- https://www.vedantu.com/question-answer/the-length-of-a-rectangle-is-increased-by-30-and-class-8-maths-cbse-5f3def2c7367fe538fad8a9b
- https://byjus.com/maths/perimeter-of-rectangle/

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