Math Problem Statement

Find the perimeter of the figure. Use 3.14 for pi.

Solution

To find the perimeter of the figure:

Description of the Shape:

This figure consists of a rectangle flanked by two semicircles. The rectangle's length is 4 inches, and the height (which is also the diameter of the semicircles) is 4 inches.


Step-by-Step Calculation:

  1. Perimeter of the Two Semicircles:

    • Together, the two semicircles form a full circle.
    • The diameter of the circle = 4 inches, so the radius rr is: r=Diameter2=42=2inches.r = \frac{\text{Diameter}}{2} = \frac{4}{2} = 2 \, \text{inches}.
    • Circumference of the full circle = 2πr2 \pi r. Substituting r=2r = 2 and π=3.14\pi = 3.14: Circumference=23.142=12.56inches.\text{Circumference} = 2 \cdot 3.14 \cdot 2 = 12.56 \, \text{inches}.
    • So, the combined perimeter of the semicircles = 12.56 inches.
  2. Perimeter of the Rectangle:

    • The rectangle contributes its two horizontal sides, each 4 inches long.
    • Total for the rectangle’s horizontal sides: 4+4=8inches.4 + 4 = 8 \, \text{inches}.
  3. Total Perimeter: Adding the semicircles' and rectangle's contributions: Total Perimeter=12.56+8=20.56inches.\text{Total Perimeter} = 12.56 + 8 = 20.56 \, \text{inches}.


Final Answer:

The perimeter of the figure is 20.56 inches.


Would you like a breakdown of a specific step? Let me know!

Here are 5 related questions to deepen understanding:

  1. How do we calculate the circumference of a circle using its radius?
  2. Why does the figure's semicircles form a full circle when combined?
  3. What is the formula for the perimeter of a composite shape like this?
  4. How would the solution change if the rectangle’s dimensions were different?
  5. Can you identify similar composite figures in real-world applications?

Tip: Always verify whether the curves in composite shapes combine to form a full circle or fraction thereof for accurate calculations!

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Math Problem Analysis

Mathematical Concepts

Geometry
Composite Shapes
Perimeter Calculation

Formulas

Circumference of a Circle = 2 * pi * r
Perimeter of Composite Shape = Sum of All Edges

Theorems

Circle Circumference Formula

Suitable Grade Level

Grades 6-8