The length of diagonal of a square is 8 cm. The length of

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

1. 2 cm
2. 2.8 cm
3. 1.414 cm
4. 5.64 cm

Correct Option: D

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