Math Problem Statement

If the length is increased by 5 inches, will the perimeter also increase? By how much?

Solution

In this problem, you're asked if increasing the length of a figure (presumably a rectangle) by 5 inches will result in an increase in the perimeter, and by how much.

The perimeter PP of a rectangle is given by the formula: P=2×(length+width)P = 2 \times (\text{length} + \text{width}) If the length is increased by 5 inches, the new length will be length+5\text{length} + 5. Let's examine the change in the perimeter:

  1. The original perimeter: P=2×(length+width)P = 2 \times (\text{length} + \text{width})
  2. The new perimeter after increasing the length by 5 inches: Pnew=2×((length+5)+width)=2×(length+width+5)P_{\text{new}} = 2 \times ((\text{length} + 5) + \text{width}) = 2 \times (\text{length} + \text{width} + 5) Pnew=2×(length+width)+10P_{\text{new}} = 2 \times (\text{length} + \text{width}) + 10

Thus, the perimeter will increase by 10 inches, which is twice the increase in the length (because the perimeter counts both the left and right sides).

Answer:

  • The perimeter will increase.
  • The perimeter changed by 10 inches.

Do you want further details or have any questions?

Here are 5 related questions:

  1. How would the perimeter change if both the length and width increased by 5 inches?
  2. How is the perimeter formula derived for different shapes, such as triangles or circles?
  3. What happens to the area of the rectangle if the length is increased by 5 inches?
  4. If only the width were increased by 5 inches, how would the perimeter change?
  5. How does the perimeter differ for three-dimensional shapes like cubes?

Tip: For a rectangle, the perimeter changes by double the increase in either the length or width, since both opposite sides contribute to the total perimeter.

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Math Problem Analysis

Mathematical Concepts

Geometry
Perimeter of Rectangles

Formulas

Perimeter of a rectangle: P = 2 × (length + width)

Theorems

Basic Perimeter Formula for Rectangles

Suitable Grade Level

Grades 5-7