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平行四邊形有甚麼特性？
Author:
Anthony OR 柯志明
Topic:
Parallelogram
English version:
http://ggbtu.be/m79826
GeoGebra
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近似值：有效數字
四邉形 (四年級) 教師版
錐體建築師
拼砌四邊形
找出對稱軸
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(3D) Tasks: Pyramid, Paper folding & Solid of revolution[20170615]
正三角形的一边在正n边形上滑动时顶点的动态轨迹
三角函数诱导公式的副本
圓面積示範
y=asin(bx+theta)+c
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Plane Figures or Shapes
Secant Line or Secant
Pie Chart or Circle Chart
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