# Homework Help: 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

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