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Find the circumference of a circle whose area is 16 times the area of the circle with diameter 7cm (Ans: 88cm)
Ans: Π R2 = 16 Π r2
R2 = 16 r 2
R2 = 16 x 7/2 x 7/2
= 49 x 4 ⇒ R = 7 x 2 = 14cm
Circumference = 2 x 22/7 x 14 = 2 x 22 x 2 = 88 cm
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