6 sqrt(3) = 10.392 feet (rounded)
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It's called an 'equilateral triangle'.
Height of an equilateral triangle = √3/2 x side = √3/2 x 20 = 10√3 ≈ 17.32
5 sqrt(3) = 8.66 (rounded)
An equilateral triangle has 3 equal sides
An equilateral triangle has 3 equal sides