added a portable building. The three steps that lead to the building rise 24 inches. The school needs to put in a ramp to make the building wheelchair accessible. By law, the ramp must have an angle of elevation no greater than 15. The maintenance crew has a board they want to use to make the ramp. The length of the board is 85 inches. 16 in. 24 in. Part A: Is the board long enough? Use inverse trig to find x, the angle of elevation of this board.