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

1.	If the length of the diagonal of a square is 20 cm, then its perimeter must be :
A.	$10\sqrt 2 \,$$ cm
B.	$40 $$ cm
C.	$40\sqrt 2 \,$$ cm
D.	$ 200 $$ cm
Answer» D. $ 200 $$ cm

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