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匹配比例的项目

匹配比例的项目
几何画板及绘图内容加载中，请稍等……
2019-05-29 09:48
函数解析几何
本范例演示如何通过调整点的位置来匹配给定的比例。核心数学概念包括比例和坐标几何。使用了Polygon, Element等GeoGebra命令。适合初中及以上学生学习比例和坐标几何。

GeoGebra 命令及参数

  1. Polygon((0, 1), (4.8, 1), (4.8, 4), (0, 4)) → Ratio1Box, f, g, h, i
  2. Polygon((0, 5.7), (14.8, 5.7), (14.8, 4.6), (0, 4.6)) → ItemBox, n, p, q, r
  3. Polygon((0.2, 2.5), (2, 2.5), (2, 1.5), (0.2, 1.5)) → aBox, j, k, l, m
  4. Polygon((2.8, 2.5), (4.6, 2.5), (4.6, 1.5), (2.8, 1.5)) → bBox, s, t, a, b
  5. Polygon(Point1Centre, Point1Centre + (2, 0), Point1Centre + (2, -1), Point1Centre + (0, -1)) → DragBox1, p_1, q_1, r_1, d_2
  6. Polygon(Point2Centre, Point2Centre + (2, 0), Point2Centre + (2, -1), Point2Centre + (0, -1)) → DragBox2, s_1, t_1, a_1, e_2
  7. Polygon(Point3Centre, Point3Centre + (2, 0), Point3Centre + (2, -1), Point3Centre + (0, -1)) → DragBox3, b_1, c_1, d_1, f_3
  8. Polygon(Point4Centre, Point4Centre + (2, 0), Point4Centre + (2, -1), Point4Centre + (0, -1)) → DragBox4, e_1, f_2, g_2, g_3
  9. Polygon(Point5Centre, Point5Centre + (2, 0), Point5Centre + (2, -1), Point5Centre + (0, -1)) → DragBox5, h_2, i_2, j_2, h_3
  10. Element(CurrentItems, 1, 3) → o
  11. Polygon((10.2, 0.7), (10.35, 0.7), (10.35, 1.1), (10.2, 1.1)) → WhiteCover1, k_2, l_2, m_2, n_2
  12. Polygon((7, 2.6), (7, 3), (7.1, 3), (7.1, 2.6)) → WhiteCover2, p_2, q_2, r_2, s_2
  13. Polygon((13.6, 2.9), (13.6, 3.3), (13.75, 3.3), (13.75, 2.9)) → WhiteCover3, t_2, a_2, b_2, c_2