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學習單：三角形任一外角與內角關係
Author:
Tsai, Dung Jung
,
Tim Brzezinski
GeoGebra
New Resources
画直线等分三角形的面积
兩位數加法
球體建築師
三位數除以一位數（一）
【案例】圆柱体内放置一个大球六个小球
Discover Resources
waaachen
正餘弦函數疊合
Clown
gjc090a23 鈍角三角形外心
Copy of cos, sin 與單位圓
Discover Topics
Tangent Function
Isosceles Triangles
Integers
Probability
Ellipse