Length of a diagonal of a square is 15 √2 cm. Find its perimeter. (A) 15cm (b) 30cm (c) 45cm (d)60cm
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Explanation:
Let the side of the square be a. Since the angles are 90, by Pythagoras theorem
a^2+a^2 = (15 root 2) ^2
2a^2= 225*2
2a^2= 450
a^2= 450/2
a^2= 225
a= 15
Therefore (A) 15cm
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