Question

The picture shows a barn door:

A barn door has two parallel bars, each of length 4 feet. A support AB runs across the diagonal between the two parallel bars. The angle made by the diagonal with the parallel bar on top is 45 degrees.

What is the distance BC between the two horizontal parallel bars?

4 by cos 45 degrees

4 sin 45°

4 by tan 45 degrees

4 tan 45°

Answer 1

apply \(\tan \) ratio in that triangle

Answer 2

familiar with SOH-CAH-TOA ?