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Find the area of the following circles. Given(i) Radius = 5 cm(ii) Diameter = 42 metre(iii) Radius = 5.6 cm |
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Answer» (i) Radius (r)= 5 cm Area of circle = πr2 = 3.14 x (5)2 = 3.14 x 25 = 78.57 sq. cm (ii) Diameter (d) = 42 m Radius (r) = 42/2 = 21 m Area of circle = πr2 = 22/7 x 21 x 21 = 22 x 3 x 21 = 66 x 21 = 1386 sq. cm (iii) Radius (r) = 5.6 cm Area of circle = πr2 = 22/7 x 5.6 x 5.6 = 22 x 0.8 x 5.6 = 98.56 sq. cm. |
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