If the length of the diagonal of a square is 20 cm, then its perimeter must be :

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If the length of the diagonal of a square is 20 cm, then its perimeter must be :

Options:

A . $$10\sqrt 2 \,$$ cm

B . $$40 $$ cm

C . $$40\sqrt 2 \,$$ cm

D . $$ 200 $$ cm

Answer: Option C

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