A semicircular piece of cardboard has a diameter of 20 cm. What is the perimeter of the piece of cardboard? (Use π = 3.14)
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Worked Solution
Step 1: The perimeter of a semicircle = curved arc + straight diameter.
Step 2: Radius = diameter ÷ 2 = 20 ÷ 2 = 10 cm.
Step 3: Curved arc = πr = 3.14 × 10 = 31.4 cm.
Step 4: Straight edge = diameter = 20 cm.
Step 5: Perimeter = 31.4 + 20 = 51.4 cm.
Answer: 51.4 cm
Correct answer: 51.4 cm
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