i have a pipe that is 10' 0 1/8'' long horizontal and has a 5/16'' rise. how do i figure my degree of slope. my isometric drawing says it has a .1 degee slope but it dont match when i do math. how do i figure this out. even if i have a 40 ' ft long pipe and drops lets say 2 3/8 inch how do i figure the degree of slope and the angle of slope which i believe is the same as the degree????

thanks for any help someone can give me