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Radii of the circles are given below, find their areas. i. 28 cm ii. 10.5 cm iii. 17.5 cm |
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Answer» i. Radius of the circle (r) = 28 cm … [Given] Area of the circle = πr2 = (22/7) x (28)2 = (22/7) x 28 x 28 = 22 x 4 x 28 = 2464 sq. cm ii. Radius of the circle (r) = 10.5 cm … [Given] Area of the circle = πr2 = (22/7) x (10.5)2 = (22/7) x 10.5 x 10.5 = 22 x 1.5 x 10.5 = 346.5 sq. cm iii. Radius of the circle (r) = 17.5 cm … [Given] Area of the circle = πr2 = (22/7) x (17.5)2 = (22/7) x 17.5 x 17.5 = 22 x 2.5 x 17.5 = 962.5 sq. cm |
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