Anytime you have a triangle (right triangles are preferred) where at least 2 angle measures and 1 side is known. Or, at least two sides and 1 angle measure.
OR..... 3 sides or three angles are known. So, sines or cosines could be used at almost anytime to find the sides and angles of a triangle!
I don't either it is quite hard to be fair
It would just be
Let me know if you want an explanation
3/5 *45/A is the equation
therefore A would equal 5*15
which is then be 75 inches
