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20 November, 18:05

Given ΔABC, AB = BC = AC. Area of ΔABC = 25 sqrt3 / 4 cm. Find the perimeter of ΔABC.

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  1. 20 November, 18:15
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    This is an equilateral triangle of height a√3/2 where a is the side length. So the area is ½a. a√3/2=a²√3/4.

    So a²=25 and a=5cm. Therefore the perimeter is 3a=15cm.
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