Answer

Correct option: D.
(D) 40 cm
We know that,
Diagonal of a square = √2 a
Where 'a' is the side of the triangle.
⇒ √2 a = 10√2
⇒ a = 10 cm
Also, we know
Perimeter of square = 4a
Where 'a' is the side of the triangle
∴ Perimeter of given square = 4(10) = 40 cm

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