Question

Will any ramp with a slope ration of 1:12 have an
angle of 4.8 degrees?

Answer 1

The ADA 4.8° rule:

Explanation:

Keep in mind, the ADA standard ratio (for commercial & public properties) is 1:12 slope which means for every 1" of vertical rise you are required to have at least one foot of ramp (4.8° incline).