Point dividing a line in the extreme and mean ratio.
分割点在极端和平均比率线。
Geometry has two great treasures, one is the theorem of Pythagoras; the other, the division of a line into extreme and mean ratio .
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。
Geometry has two great treasures, one is the theorem of Pythagoras; the other, the division of a line into extreme and mean ratio .
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。
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