绕非原点的旋转
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①本范例演示了图形绕非原点旋转的现象;②涉及核心数学概念包括旋转、角度、几何变换;③作图要点使用了GeoGebra命令Polygon(多边形)、Rotate(旋转)、Segment(线段)、Angle(角度)、LaTeX等;④适合高中阶段学习几何变换的学生使用。
GeoGebra 命令及参数
Polygon(A, B, C) → t1, c, a, bRotate(A, Counterclockwise, D) → A'Rotate(B, Counterclockwise, D) → B'Rotate(C, Counterclockwise, D) → C'Polygon(A', B', C') → t1', c', a', b'Rotate(A, (-Clockwise), D) → A'_1Rotate(B, (-Clockwise), D) → B'_1Rotate(C, (-Clockwise), D) → C'_1Polygon(A'_1, B'_1, C'_1) → t1'_1, c'_1, a'_1, b'_1Segment(D, A) → fSegment(D, A') → gSegment(D, A'_1) → hAngle(A, D, A') → γAngle(A'_1, D, A) → δLaTeX(A', true, true) → text1LaTeX(B', true, true) → text2LaTeX(C', true, true) → text3LaTeX(A'_1, true, true) → text4LaTeX(B'_1, true, true) → text5LaTeX(C'_1, true, true) → text6LaTeX(A, true, true) → text7LaTeX(C, true, true) → text8LaTeX(B, true, true) → text9