# In #triangle MNP, m=16, n=15, p=8#, how do you find the cosine of each of the angles?

##### 1 Answer

Dec 9, 2016

#### Explanation:

If you know two sides and the included angle of a triangle ABC, you can apply the cosine thorem:

Now you can use the inverse formula to know the cosine of an angle when you know the three sides:

Then