just in case you forgot, to find the angles of an isosceles triangle, first bisect the triangle into two right triangles, to find the first two angles (A), measure the new side of the triangle, then it's
tan A = opposite side/adjacent side
if you don't remember what "tan" is it's tangent. if you don't remember how to find the tangent, you aren't supposed to, you need a scientific calculator.
i had to re-learn all this last night to help a friend figure out what angles to cut some plywood to make a pyramid. it was good for the brain but frustrating.
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