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定理介紹：切線與半徑 | Tangent and Radius
Author:
Ricky LI
,
chisunch1
GeoGebra
New Resources
近似值：有效數字
長方體平面投影 (Codex版)
兩組對邊相等的四邊形
找出對稱軸
拼砌四邊形
Discover Resources
三角形的心
ghseh 二次函數左右x值差
高尔顿钉板实验
堆四顆球
直线和圆的位置关系
Discover Topics
Arithmetic
Standard Deviation
Curve Sketching
Isosceles Triangles
Complex Numbers