Triangle formula

1. Nov 4, 2004

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?

2. Nov 4, 2004

maverick280857

Do you know the cosine rule?

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

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