P4周界与中位线
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①本范例演示了多边形周界与中位线的几何关系及计算方法;②涉及核心概念包括周界计算、中位线性质、向量运算、线性规划与优化、二维向量及指数函数;③构造要点运用了Segment(线段)、Sequence(序列)、Polygon(多边形)等命令,创建了VPoly系列对象及多种颜色标识;④适合高中阶段数学教学与几何作图实践,可用于理解空间向量与函数图像的交互。
GeoGebra 命令及参数
Segment(Blue01a, Blue01b) → Blue01Segment(Blue02a, Blue02b) → Blue02Segment(Blue03a, Blue03b) → Blue03Segment(Blue04a, Blue04b) → Blue04Segment(Red01a, Red01b) → Red01Segment(Red02a, Red02b) → Red02Segment(Red03a, Red03b) → Red03Segment(Red04a, Red04b) → Red04Segment(Blue05a, Blue05b) → Blue05Segment(Red05a, Red05b) → Red05Segment(Blue06a, Blue06b) → Blue06Segment(Red06a, Red06b) → Red06Sequence(Sequence[(s, t), s, 0, 25], t, -5, 13) → ListDotsSegment(Blue07a, Blue07b) → Blue07Segment(Blue08a, Blue08b) → Blue08Segment(Blue09a, Blue09b) → Blue09Segment(Blue10a, Blue10b) → Blue10Segment(Blue11a, Blue11b) → Blue11Segment(Blue12a, Blue12b) → Blue12Segment(Red07a, Red07b) → Red07Segment(Red08a, Red08b) → Red08Segment(Red09a, Red09b) → Red09Segment(Red10a, Red10b) → Red10Segment(Red11a, Red11b) → Red11Segment(Red12a, Red12b) → Red12Segment(Green01a, Green01b) → Green01Segment(Green02a, Green02b) → Green02Segment(Green03a, Green03b) → Green03Segment(Green04a, Green04b) → Green04Segment(Green05a, Green05b) → Green05Segment(Green06a, Green06b) → Green06Segment(Green07a, Green07b) → Green07Segment(Green08a, Green08b) → Green08Segment(Green09a, Green09b) → Green09Segment(Green10a, Green10b) → Green10Segment(Green11a, Green11b) → Green11Segment(Green12a, Green12b) → Green12Segment(Green13a, Green13b) → Green13Segment(Green14a, Green14b) → Green14Polygon(VPoly1Fa, VPoly1Fb, VPoly1Fc, VPoly1Fd, VPoly1Fe, VPoly1Ff) → Poly1F, vpoly1fa, vpoly1fb, vpoly1fc, vpoly1fd, vpoly1fe, vpoly1ffPolygon(VPoly2Fa, VPoly2Fb, VPoly2Fc, VPoly2Fd, VPoly2Fe) → Poly2F, vpoly2fa, vpoly2fb, vpoly2fc, vpoly2fd, vpoly2fePolygon(VPoly1Ma, VPoly1Mb, VPoly1Mc, VPoly1Md, VPoly1Me, VPoly1Mf) → Poly1M, SPoly1Ma, SPoly1Mb, SPoly1Mc, SPoly1Md, SPoly1Me, SPoly1MfPolygon(VPoly2Ma, VPoly2Mb, VPoly2Mc, VPoly2Md, VPoly2Me) → Poly2M, SPoly2Ma, SPoly2Mb, SPoly2Mc, SPoly2Md, SPoly2Me