Height difference between two points in relation to their horizontal distance in percent. The angle is calculated with: arcus tangens x (height difference broken by distance). An upward slope is called slope, a downward slope (the two terms are only linguistically different, mathematically there is no difference). At 30% slope, the other 100 meters (horizontally) distant point is 30 meters higher, giving an angle of 16.69 °. An inclination of 75% gives 36.87 °. A slope at 100% corresponds to an angle of 45 °, ie 100 meters horizontally and 100 meters vertically. Up to this tendency is in viticulture the employment of Monorackbahnen A monorail of 200% corresponds to an angle of ~ 64 °. For inclination angles just below 90 °, the slope grows to infinity. A slope of 90 ° corresponds to a vertical wall. More than 90 ° correspond to overhanging walls.