hyperbolic geometry in a plane 双曲平面度量几何学
The "Elements" (of Euclides Geometry) spreads the knowledge of plane geometry in China.
《几何原本》（欧几里得几何）在中国传播了平面几何的知识。
This paper lists the transformation of thinking in junior school plane geometry application.
本文列举了转化思想在初中平面几何中的应用。
The theorems, formulas and principles in plane geometry reveal the intrinsic relations and basic laws of geometrical concepts.
平面几何的定理、公式、法则反映了几何概念的内在联系，揭示了它们之间的基本规律。
应用推荐