中线重心定理(无字证明)
几何画板及绘图内容加载中,请稍等……
①本范例演示了如何在一个三角形中构造三条中线及其重心;②涉及的核心数学概念包括中线、重心、几何作图;③作图要点——使用了Segment(线段)、Midpoint(中点)、Intersect(交点)、Polygon(多边形)等GeoGebra命令;④适合高中数学学生用于理解中线重心定理的几何性质,可作为辅助教学工具。
GeoGebra 命令及参数
Segment(A, B) → a_1Segment(B, C) → b_1Midpoint(a_1) → E_1Midpoint(b_1) → F_1Segment(C, E_1) → d_1Segment(A, F_1) → e_1Intersect(d_1, e_1) → GSegment(C, G) → cSegment(G, E_1) → dSegment(A, G) → aSegment(G, F_1) → bSegment(B, G) → eMidpoint(A, C) → EMidpoint(C, B) → DMidpoint(B, A) → FSegment(A, E) → c_1Segment(E, C) → f_1Segment(C, D) → lSegment(D, B) → mSegment(B, F) → nSegment(F, A) → pSegment(G, E) → fSegment(C, F) → gSegment(A, D) → hSegment(B, E) → iMidpoint(C, G) → HMidpoint(A, G) → IMidpoint(B, G) → JSegment(C, H) → k_1Segment(H, G) → l_1Segment(G, F) → m_1Segment(A, I) → n_1Segment(I, G) → p_1Segment(G, D) → q_1Segment(B, J) → r_1Segment(J, G) → s_1Segment(G, E) → t_1Polygon(A, B, C) → poly1, c_2, a_2, b_2