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折纸角度探究2
Author:
陈力
Topic:
Constructions
,
Symmetry
GeoGebra
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垂直線的斜率
斜率的值
平行線的判定
撒针估算面积实验
圓的基本性質
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圆心角和圆周角
△ A B E △ABE 、 △ A C E △ACE 的內切圓半徑分別為 r 2與 r 1,兩者 可以互換嗎
elevation
五上複合圖形的面積
我的第一个绘本
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Arithmetic
Isosceles Triangles
Plane Figures or Shapes
Logarithmic Functions
Vectors 2D (Two-Dimensional)