The height of an equilateral triangle measures 9
cm. Find its area.
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Height of an equilateral ∆ = √3a/2 where a is it's side.
So, 9√3 = √3a/2
a = 18
Area of equilateral ∆ = √3a^2/4
= √3 × 18 × 18/4
= 81√3 or 140.3
So, 9√3 = √3a/2
a = 18
Area of equilateral ∆ = √3a^2/4
= √3 × 18 × 18/4
= 81√3 or 140.3
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