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等腰梯形的性质 by Harshitaa Arunkumar

等腰梯形的性质 by Harshitaa Arunkumar
几何画板及绘图内容加载中，请稍等……
2017-12-06 01:52
多边形角几何作图
①本范例演示等腰梯形的几何性质；②涉及核心概念包括多边形、角度、距离、中点、线段等；③作图要点：使用 GeoGebra 命令 Point（点）、Segment（线段）、Distance（距离）、Midpoint（中点）、Angle（角度）、PolyLine（多边形）；④适合初中及以上学生学习和理解等腰梯形的几何特性。

GeoGebra 命令及参数

  1. Point(Circle[A, 5]) → B
  2. Segment(A, B) → f
  3. Point(Circle[C, 7]) → D
  4. Segment(C, D) → g
  5. Segment(A, C) → h
  6. Segment(B, D) → i
  7. Distance(A, C) → distanceAC
  8. Midpoint(A, C) →
  9. Distance(B, D) → distanceBD
  10. Midpoint(B, D) →
  11. Angle(B, D, C) → α
  12. Angle(D, C, A) → β
  13. PolyLine((5.210000000000002, 7.420000000000003), (NaN, NaN), (5.710000000000002, 7.280000000000003), (5.770000000000002, 7.2600000000000025), (5.830000000000002, 7.240000000000003), (5.890000000000002, 7.220000000000002), (5.950000000000002, 7.200000000000003), (6.0100000000000025, 7.180000000000002), (6.070000000000002, 7.140000000000002), (6.130000000000003, 7.120000000000003), (6.190000000000002, 7.100000000000002), true, (5.210000000000002, 7.420000000000003), (5.290000000000002, 7.420000000000003), (5.350000000000002, 7.400000000000003), (5.410000000000002, 7.380000000000003), (5.470000000000002, 7.360000000000003), (5.530000000000002, 7.3400000000000025), (5.590000000000002, 7.320000000000003), (5.650000000000002, 7.3000000000000025)) → stroke1
  14. PolyLine((11.010000000000003, 7.160000000000003), (NaN, NaN), (11.530000000000005, 7.400000000000003), (11.590000000000003, 7.420000000000003), (11.650000000000004, 7.480000000000003), (11.710000000000004, 7.500000000000003), (11.770000000000005, 7.540000000000003), (11.830000000000004, 7.560000000000003), (11.890000000000004, 7.600000000000003), (11.950000000000005, 7.620000000000003), (12.010000000000005, 7.640000000000003), true, (11.010000000000003, 7.160000000000003), (11.070000000000004, 7.180000000000002), (11.130000000000004, 7.200000000000003), (11.190000000000005, 7.240000000000003), (11.250000000000004, 7.280000000000003), (11.330000000000004, 7.320000000000003), (11.390000000000004, 7.360000000000003), (11.470000000000004, 7.380000000000003)) → stroke2
  15. Segment(A, D) → j
  16. Segment(B, C) → k
  17. Distance(A, D) → distanceAD
  18. Midpoint(A, D) →
  19. Distance(B, C) → distanceBC
  20. Midpoint(B, C) →
  21. Angle(C, A, B) → γ
  22. Angle(A, B, D) → δ