Find the measure of a. me as soon as you can, you. a. 8 b. 16 c. 3 d. 6

If you know the length of two sides and the measure of the angle between them, you can find the third side using the law of cosines: if and are known, and so is the angle between them, the remaining side is given by

So, in your case, the expression becomes

This means that we can deduce the value for a by squaring both sides (we're not considering both signs of the root because it makes no sense to have a negative length: