pole triangle
... 极心三角线 triangle pole 极心三角形 pole triangle 极心改换速度 pole changing velocity ...
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本文用射影观点考察三角形的“五心”定理，通过配极变换推出五个新的命题。
The author of the essay studies the transmutation of the triangular theorem of "Five Centers" theorem from the projective viewpoint and puts forward five thoughtful propositions through polarization.
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