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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
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兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
【案例】2018年全国1卷理科12题
拼砌四邊形
找出對稱軸
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籐編直線與曲線
test
外公切線段長求法
normal vector
「相似三角形」任务2的副本
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Solids or 3D Shapes
Rectangle
Integral Calculus
Variance
Trigonometric Functions