To solve this problem you must apply the proccedure shown below:
1. Let's divide the triangle in two right triangles. Now, you must find the height and the base of the triangle on the left, as below:
Sin(60°)=h/9 h=(9)(Sin(60°) h=(9√3)/2 h=7.79
Cos(60°)=b/9 b=9/2 b=4.5
3. Now you can calculate the value of x, which is the hypotenuse of the triangle on the right, by applying the Pythagorean Theorem. You have that its base is:
