Question 1155232: Given SSS information about an isosceles triangle, describe the process you would use to calculate the sizes of its angles. Found 2 solutions by ikleyn, ankor@dixie-net.com:Answer by ikleyn(52781) (Show Source):
You can put this solution on YOUR website! Given SSS information about an isosceles triangle, describe the process you would use to calculate the sizes of its angles.
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Bisect the top angle giving you two identical right triangles.
With one of the equal sides and and half the base use the cosine to find the equal angle, subtract twice that angle from 180 to get the top angle