The perimeter (in cm) of a square circumscribing a circle of radius a cm, is
A. 8 a
B. 4 a
C. 2 a
D. 16 a
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b . 4a
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Diagonal of square = diameter of circle
= 2a
Perimeter of square = 2×2^1/2 × diagonal
= 4×2^1/2 ( i.e. 4root 2)
= 2a
Perimeter of square = 2×2^1/2 × diagonal
= 4×2^1/2 ( i.e. 4root 2)
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