When a basketball hits a hard, level surface, it bounces off at the same angle at which it hits. Use the figure to find the angle at which the ball hit the floor.

Let the angle = x

Using the figure below, to find x, setup the equation:

x+70+x=180

2x+70=180

2x=110

x=55°

So the ball hits the surface at 55° and bounces back at 55°.

Answer: 55°