a roof rises 1.9 feet vertically and 9.1 feet horizonally. what is the grade of the roof?

Answer 1

TanA = 1.9/9 = 0.2111
A = 11.9 Deg.
Grade = h/L = Sin(11.9) = 0.206.

Answer 2

Grade = Sin(11.9) = 0.206 = 20.6%