Math Problem Statement

Find the perimeter and total area of the composite shape shown below. All measurements are given in inches. Use π = 3.14 in any formulas used.

Solution

The composite shape in the image consists of a central square and four quarter-circles at the corners. Let’s break the shape down step by step to calculate both the perimeter and the total area.

Step 1: Central Square

  • Side of the square = 8 inches
  • Area of the square = side2=82=64square inches\text{side}^2 = 8^2 = 64 \, \text{square inches}.

Step 2: Quarter-Circles

  • Each quarter-circle has a radius of 4 inches (as indicated on the diagram).
  • Area of one full circle = π×r2=3.14×42=50.24square inches\pi \times r^2 = 3.14 \times 4^2 = 50.24 \, \text{square inches}.
  • Since each quarter-circle is 14\frac{1}{4} of a full circle, the area of one quarter-circle is: 14×50.24=12.56square inches\frac{1}{4} \times 50.24 = 12.56 \, \text{square inches}
  • There are 4 quarter-circles, so the total area of the circular parts is: 4×12.56=50.24square inches4 \times 12.56 = 50.24 \, \text{square inches}

Step 3: Total Area

  • Total area of the composite shape = Area of the square + Area of the quarter-circles 64+50.24=114.24square inches64 + 50.24 = 114.24 \, \text{square inches}

Step 4: Perimeter

  • The perimeter consists of the curved parts of the four quarter-circles. Together, these four quarter-circles form a complete circle.
  • The circumference of the full circle formed by the quarter-circles is: Circumference=2πr=2×3.14×4=25.12inches\text{Circumference} = 2 \pi r = 2 \times 3.14 \times 4 = 25.12 \, \text{inches}

Thus, the perimeter of the shape is 25.12 inches.

Conclusion:

  • The correct answer is Perimeter = 25.12 inches, Area = 114.24 square inches. None of the provided options seem to exactly match this result, but based on the problem-solving process, this would be the accurate calculation.

Would you like any details or further clarifications? Here are five related questions:

  1. How do we handle composite shapes with more complex geometries?
  2. Why does the perimeter calculation only consider the curved parts and not the straight edges?
  3. How can we verify the results using an approximation of π\pi?
  4. How would the solution change if the central square was larger or smaller?
  5. What happens to the area if the radius of the quarter-circles is doubled?

Tip: When dealing with composite shapes, always split them into familiar basic shapes (like circles, squares, or triangles) to simplify the calculations.

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Math Problem Analysis

Mathematical Concepts

Geometry
Composite Shapes
Circle
Perimeter
Area

Formulas

Area of a square = side^2
Area of a circle = π × r^2
Perimeter of a circle = 2πr

Theorems

Formula for area and perimeter of circles and squares

Suitable Grade Level

Grades 7-9