triangle formula

[IndyAndy]

if you know the side lengths of an isocolese triangle and nothing else, then can you find the angle measures of that triangle? is there a formula for this?

[maverick280857]

Do you know the cosine rule?

If a = BC, b = CA, c = AB then

\cos C = \frac{a^2 + b^2 - c^2}{2ab}