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Let's express the side length of an equilateral triangle, a, in term of the height h.

a = (1/3)(h)(sq.root of 3)

The perimeter equals to 3a. So we have:

3a = 3[(1/3)(h)(sq.root of 3)] = (h)(sq.root of 3)] = 18(sq.root of 3)

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Q: Find the perimeter of an equilateral triangle whose height is 18 Please explain?
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