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(B) The perimeter of an equilateral triangle is given by the formula: $P = 3 	imes 	ext{side}$.Given $P = 12$,we have $12 = 3 	imes 	ext{side}$.Th

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$4 \sqrt{3}$

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(B) The perimeter of an equilateral triangle is given by the formula: $P = 3 	imes 	ext{side}$.Given $P = 12$,we have $12 = 3 	imes 	ext{side}$.Therefore,the side length is $	ext{side} = \frac{12}{3} = 4$.The area of an equilateral triangle is given by the formula: $	ext{Area} = \frac{\sqrt{3}}{4} 	imes 	ext{side}^2$.Substituting the side length: $	ext{Area} = \frac{\sqrt{3}}{4} 	imes 4^2 = \frac{\sqrt{3}}{4} 	imes 16 = 4\sqrt{3}$.

The perimeter of an equilateral triangle is $12$. Then,its area is............

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