vertical distance | : | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
---|---|---|---|---|---|---|---|---|---|
incline distance | : | 14 | 10 | 7 | 6 | 5 | 4 | 3 | 2 |
angle approx ~ | : | 4 | 6 | 8 | 10 | 12 | 15 | 20 | 30 |
Formula with <5% accuracy for angles <30 degrees, so ratio >2:
angle = 60 * vertical distance / incline distance
or in other words:
angle = 60 / ratio(incline : vertical)