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What is the perimeter of the square, which has diagonal of 20cm?

Option:
A. 20 cm
B. (20 * sq. root 2) cm
C. 40 cm
D. (40 * sq. root 2) cm
Answer: D . (40 * sq. root 2) cm

Justification:

Diagonal of the square is 2a^2 = 20^2 = 400

=> a^2 = 200

=> a = 10 * Sq. root 2

 

Permeter of the square  = 4a = 40 * Sq. root 2 cm.

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