Point dividing a line in the extreme and meanratio.
分割点在极端和平均比率线。
2
Geometry has two great treasures, one is the theorem of Pythagoras; the other, the division of a line into extreme and meanratio .
几何学有两大珍宝，其一是毕达哥拉斯定理，另一个是分一线段为中外比。
3
35 mm film has the dimensions 36 mm by 24 mm (3:2 ratio) - golden mean ration of 1.6 to 1 Points of intersection are recommended as places to position important elements in your picture.