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The length of diagonal of a square is 8 cm. The length of the side of the square is?

2 cm
2.8 cm
1.414 cm
5.64 cm

Correct Answer: 5.64 cm

Explanation:

a² + a² = (8)²
⇒ 2a² = 64
⇒ a² = 32
∴ a = √32 = 4√2
= 4 x 1.41
= 5.64 cm

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