# How do you find the exact value of the third side given #triangle DEF#, #d=sqrt3#, e=5, and #mangleF=pi/6#?

##### 1 Answer

Dec 13, 2017

#### Answer:

#### Explanation:

Since we don't know that the triangle is a right triangle, we're required to use the Cosine Law. I will also presume that

The Law of Cosines states that:

In our case, it becomes (I'll call the unknown side

Next we take the square root on both sides: