Answer:
4.81 m
Explanation:
area of Equilateral triangle with side length a : area = (√3/4) a²
10 = (√3/4) a²
a² = 40√3 / 3 = 23.09
a = 4.81 m
if you are in Trigonometry: h/a = sin 60°
h = (√3 / 2) a
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