I am now working on trigonometry dealing with grade. If I am given that the grade of a road is 7%, what angle does the road make with the horizontal? How to solve other problems like this? Thanks
GenericUsernameHere, a 7% grade means that for every 100 feet of horizontal distance, the road rises 7 feet.....in other words, we have a right triangle with one leg = 7 and the other = 100 and we're looking for the angle opposite the shorter leg ...so.....using the tangent inverse, we have
tan-1 (7 / 100) = about 4° with the horizontal
Does that help ???