If the lengths of three sides of a triangle are given, use the "cosine law" to determine its angles.
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Answer by ankor@dixie-net.com(22740) (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