Math Problem Statement

The perimeters of the two figures have the same measure. Write and solve an algebraic equation to find the value of x.

The perimeters of the two figures have the same measure. Write and solve an algebraic equation to find the value of x.

Solution

Let's analyze the given shapes and write the algebraic equation.

For the Rectangle:

  • The length is 5x25x - 2.
  • The width is 3x3x.

The perimeter PP of a rectangle is given by: Prectangle=2(length+width)P_{\text{rectangle}} = 2(\text{length} + \text{width}) Substituting the given values: Prectangle=2((5x2)+3x)P_{\text{rectangle}} = 2((5x - 2) + 3x) Simplifying: Prectangle=2(8x2)=16x4P_{\text{rectangle}} = 2(8x - 2) = 16x - 4

For the Triangle:

  • The sides are x+10x + 10, 2x+32x + 3, and 10x510x - 5.

The perimeter PP of a triangle is the sum of the lengths of its sides: Ptriangle=(x+10)+(2x+3)+(10x5)P_{\text{triangle}} = (x + 10) + (2x + 3) + (10x - 5) Simplifying: Ptriangle=x+10+2x+3+10x5=13x+8P_{\text{triangle}} = x + 10 + 2x + 3 + 10x - 5 = 13x + 8

Set the Perimeters Equal:

Since the perimeters of the two shapes are the same: 16x4=13x+816x - 4 = 13x + 8

Solve for xx:

  1. Subtract 13x13x from both sides: 16x13x4=816x - 13x - 4 = 8 3x4=83x - 4 = 8

  2. Add 4 to both sides: 3x=123x = 12

  3. Divide by 3: x=4x = 4

Thus, the value of xx is 4\boxed{4}.

Let me know if you would like further details or clarifications.

Related Questions:

  1. What is the perimeter of the rectangle when x=4x = 4?
  2. What is the perimeter of the triangle when x=4x = 4?
  3. Can you find the area of the rectangle with the given dimensions?
  4. What are the lengths of the triangle's sides when x=4x = 4?
  5. How would the equation change if the perimeter of the triangle was greater than the rectangle?

Tip:

Always double-check the perimeters of both shapes after solving to ensure accuracy.

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Math Problem Analysis

Mathematical Concepts

Algebra
Perimeter of Geometric Shapes

Formulas

Perimeter of rectangle: P = 2(length + width)
Perimeter of triangle: P = sum of the sides

Theorems

Basic Algebraic Manipulation

Suitable Grade Level

Grades 7-9