三角形五心是指三角形的重心、外心、内心、垂心、旁心。三条中线的交点是重心，三边垂直平分线的交点是外心，三条内角平分线的交点为内心，三角形三条高线的交点为垂心。 与三角形的一边及其他两边的延长线都相切的圆叫做三角形的旁切圆，旁切圆的圆心叫做三角形旁心。
并且有三角形、五角星、心形印章可提供宝宝随意涂鸦，培养宝宝的画画兴趣和多方面的求知欲。
And there is a triangle, five-pointed star, heart-shaped baby seal provides free graffiti, paint your baby's interest and foster a wide range of intellectual curiosity.
通过五个定理给出三角形“五心”的向量表示方法，并提供证明。
The author gave out the delta the vector representation of "five minds" by means of five theorems. and supplied the proof.
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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