A 10 ft ladder is placed against a building so that the ladder makes a 78 degree angle with the ground. To the nearest tenth of a foot, at what height does the ladder touch the building?
The 10 ft is the hypotenuse of a right triangle
sin 78 = opp / hyp where opp is the height
sin 78 = height/10
10 sin 78 = height (use calculator)