Find the area of a circle having diameter 21 cm
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Answer:
346.36cm² is the area of a circle having diameter 21 cm
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Step-by-step explanation:
radius = diameter÷2
= 21÷2
= 10.5cm
area of circle = πr²
= 3.14 × (10.5)²
= 3.15 × 110.25
= 346.19 cm²
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