SOLUTION: what is the height of an equilateral triangle whose sides are each 18cm long?

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Question 12090: what is the height of an equilateral triangle whose sides are each 18cm long?
Answer by Pieter(35) About Me  (Show Source):
You can put this solution on YOUR website!
hi,
when you apply some goniometrics it is very simple!
All you have to do is cut the triangle into 2 pieces, two traingles with one angle of 90°. In one of these triangles you can apply simple goniometry:
h=18*cos(60°)


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