Question
Find the circumference and area of a circle with radius
21 cm. Take π = 22/7.Solution
Radius r = 21 cm Circumference = 2πr = 2 × (22/7) × 21 = 2 × 22 × 3 = 132 cm Area = πr² = (22/7) × 21 × 21 = (22/7) × 441 = 22 × 63 = 1386 cm² Answers: Circumference = 132 cm Area = 1386 cm²
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