need help on this one

Question

While visiting a museum, an observer views a painting that is 3 ft high and hangs 6 ft above the ground. See the figure. Assume her eyes are 5 ft above the ground, and let x be the distance from the spot where she is standing to the wall displaying the painting. Find the viewing angle θ, when she is 20 feet away (x = 20).

Answer 1

Draw and label a diagram!

tan θ_bottom = 1 / 20

tan θ_top[ = 4 / 20

θ_view = θ_top - θ_bottom