The perimeter of a square is equal to the radius of a circle having area 39424 sq cm. What is the area of the square?

1225 sq cm

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441 sq cm

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784 sq cm

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Can't say

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None of these

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Solution

The correct option is C
784 sq cm

$R^{2} = 39424 R = 112$
Perimeter of square = 4a = 112
Side of square = 112/4 = 28
Area of square = $28^{2} = 784 c m^{2}$

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