The side common to the 30 angles has a length of 4. Solution A sketch of the triangle is always helpful. Let x be the unknown length. You know how to use the properties of a right triangle to solve for the sides of a triangle, so if you have to solve for the side of a different kind of triangle, you can use a right triangle within the given triangle. The ratio of the side adjacent to the 30 angle and the hypotenuse is .
Solution Sketch the triangle.
Again, see if you can solve the problem by creating right triangles.