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The area of an equilateral triangle is √ 243 /4 sq cm. Find the length of its side.

3 cm
3√3 cm
9 cm
√3 cm

Correct Answer: 3 cm

Explanation:

According to the question,
area = √3a²/4
= √243 /4
⇒ a² = √81 x 3/√3
∴ a = √9
= 3 cm

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