A cartographer at point C sites a prominent rock feature, at point R, East from his location. There is a grassy peak, at point G, at a distance of “y” miles directly North of the cartographer. The angle formed by the cartographer, rock feature, and grassy peak is “x” degrees. See the diagram below. Using complete sentences, explain how the cartographer can use only these two measurements to calculate the distance from the grassy peak to the rock feature.