Question

9.

A street in San Francisco has a 20% grade - 20 feet of rise for every 100 feet of
horizontal distance. What is the angle of elevation of the street?

Answer 1

A street in San Francisco has a 20% grade - 20 feet of rise for every 100 feet of

horizontal distance. What is the angle of elevation of the street?

Let

x ----> angle of elevation

we have that

tan(x)=20/100

tan(x)=1/5

x=tan^-1(1/5)=11.31 degrees

therefore

the angle of elevation is 11.31 degrees