(1/2) square-root of (3) times the length of any side.
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It is two-thirds of the triangle's height.
By using Pythagoras' theorem
By using Pythagoras' theorem.
In effect an equilateral triangle is made up of two right angle triangles joined together so use Pythagoras' theorem to find the height:- 182-92 = 243 and the square root of this will be the height of the equilateral triangle which is about 15.588 cm
let the side be x...the height is (sq.root of 3)/2 multiplied by x