So first of all, we need to know the total area of the triangle. It is 180°, because all triangle = 180°. So we can do 60°+30°, which is 90°. Next we do 180°-90°, which equals 90°. This means that your missing angle is 90°. So now, to find the side. the base is your bottom and your side on the right. that is what the B is. we need to figure out the slanted line, which is side C. to do that, we need to first take our two angles for side C, 60° and 30°, and add them together which is 90°. then we need to use our sine function on our calculator, and do SIN(90). We should get 1. Then we add that to our base value, and we get 13. (PS pls vote brainiest if im right)
