Discussion

Explanation:

Perimeter = 3 × Side = 75 cm.
∴ Side = 25 cm.

Area of an equlateral triangle = $\frac{\sqrt{3}}{4}$(side)²

= $\frac{\sqrt{3}}{4}\times {25}^2$

= $\frac{625\sqrt{3}}{4}$

Hence, option (b).

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