Question

Dedrea is making a bike ramp on the sidewalk in front of their house. They place a wood plank on top of blocks to form the ramp. The blocks are one foot in height, and the distance from the base of the blocks to where the wood plank touches the sidewalk is five feet. What is the approximate angle formed between the sidewalk and the base of the ramp

Answer 1

Let θ be the angle between the sidewalk and the ramp. Then tan θ = rise/run = 1/5, so

θ = arctan(1/5) ≈ 11.3°.

(About 11 degrees.)