find the circumference of circle whose area is 4 times the other of a circle with diameter 21 CM
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Radius of the circle = 21/2
Area of given circle = π r^2 = 346.185
Area of the first circle = 4 × Area of second
= 1384.74
πR^2 = 1384.74
R^2 = 440.60
R = 21 ( Approx)
Circumference = 2πr = 2 ×3.14×21
= 131.88 Ans
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