find the area and circumference of a circle whose radius is ,a)21 cm ,b)2.7 cm
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a)
radius = 21 cm
circumference = 2×22/7×21
= 132 cm
area = 22/7×21×21
= 1386 sq cm
b)
radius =2.7cm
circumference = 2× 22/7×2.7
= 16.9 cm
area = 22/7× 2.7×2.7
= 22.92 sq cm
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