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定理介紹：切線與半徑 | Tangent and Radius
Author:
Ricky LI
,
chisunch1
GeoGebra
New Resources
畫出對稱圖形
找出對稱軸
異分母分數減法
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
Discover Resources
Redefining Trigonometry by a Unit Circle
Dart Board
线段
五上-CP4-第三节平行四边形面积1
畫三角形 第2題
Discover Topics
Logarithm
Natural Numbers
Exponent
Ellipse
Dilation