Correct Answer: Option B

Explanation

Height of an equilateral triangle, h = a\(\frac{\sqrt{3}}{2}\), where a is the side of the equilateral triangle.

10\(\sqrt{3}\) = a\(\frac{\sqrt{3}}{2}\)

cross multiply--> 2 x 10\(\sqrt{3}\) = a\(\sqrt{3}\)

\(\sqrt{3}\) cancels out  \(\sqrt{3}\) on both sides

20 = a

The perimeter of an equilateral triangle is: P = 3a

P = 3 * 20 = 60cm

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