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圓心角
Author:
范欣茹
GeoGebra
New Resources
兩位數加法
圓的切線方程
平行線的斜率
兩位數除以一位數（二）
多邊形的面積
Discover Resources
圓圓求切圓
下和
軌跡觀察
拋物線3-平行四邊形法
三阶魔方（magic cube）
Discover Topics
Perimeter
Angles
Definite Integral
Arithmetic Operations
Trapezoid