Question

Don’t know how to solve

Answer 1

Θ ≈11.31°

Explanation:

the model is a right triangle with side opposite being the height and side adjacent the horizontal length , in relation to angle Θ , then

using the tangent ration

tanΘ =
`(opposite)/(adjacent)` =
`(4)/(20)` , then

Θ =
`tan^(-1)` (
`(4)/(20)` ) ≈ 11.31° ( to 2 dec. places )