Question 250752: the side length of an equilateral triangle is 20 inches. find the length of an altitude of the triangle? Answer by drk(1908) (Show Source):
You can put this solution on YOUR website! Draw an equilateral triangle and label the sides 20. Draw an altitude (height) from the top vertex to the opposite bottom side. This cuts your triangle into to halves. You have hypotenuse = 20 and one side on the bottom leg = 10. Use Pythagorean theorem to find the height.
b = 10sqrt(3).
(