800 cm2, 80 cm
400 cm, 80 cm2
80 cm, 800 cm2
400 cm2, 80 cm
Correct answer is D
Using Pythagoras theorem
⇒ (20√2)2=x2+x2
⇒ 800 = 2x2
⇒ 400 = x2
⇒ x = √400 = 20 cm
∴ Area of a square = x2=202=400cm2
∴ Perimeter of a square = 4x = 4 x 20 = 80 cm
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