Question

Find perimeter of a square if its diagonal is 10√ 2 cm.Select the correct alternative.
(A)10 cm
(B) 40√2 cm
(C) 20 cm
(D) 40 cm

Answer 1

40cm is the answer for your question by the formula 2√2d

Now solve 2√2 * 10√2

Answer 2

Solution :

Let the side of the square = a

Diagonal ( d ) = 10√2

=> √2 a = 10√2

=> a = 10√2/√2

a = 10 cm ---( 1 )

Perimeter = 4a

P = 4 × 10

P = 40 cm

Therefore ,

Option ( D ) is correct.

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