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If diameter of a circle is 21 cm, then what will be the circumference of circle?1. 264 cm2. 128 cm3. 66 cm4. 132 cm |
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Answer» Correct Answer - Option 3 : 66 cm Concept: Circumference of a circle = 2πr, where 'r' is radius. Solution: Given: Diametre = 21 cm So, Radius = 21/2 Using above formula, we get, 2 × 22/7 × 21/2 = 66 cm Hence, we conclude that the circumference is 66 cm. |
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