One way of describing a ramp or sloped surface is to describe it in terms of degrees of slope angle.
The slope angle of a ramp is the angle formed with a horizontal line expressed in degrees. In order to determine the degrees of slope angle of a surface, you will need a protractor device in order to measure the slope angle in degrees.
In order to measure the degrees of slope angle for a ramp or sloped surface, you will need a protractor or inclinometer.
Setting one flat side of the protractor on the surface to be measured will cause the gauge to show the degrees of slope angle of the surface.