The Consumer Product Safety Commission recommends that the base of a ladder should be set out 1 foot from a wall for every 4 feet of vertical rise.

Question

a. What angle will a ladder so situated make with the ground?

b. If Joe follows these recommendations, how far up the wall (vertically) will his 16 foot ladder reach?

Answer 1

tanØ = 4/1 = 4
Ø = 75.96
The angle should be 76°

by ratio:
4/1 = 16/x
x = 4