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橢圓之極偶 / polarity for ellipse
Author:
XIE Yuheng
GeoGebra
New Resources
第八周作业
判斷球體
三位數除以一位數（二）
找出對稱軸
算柱 (兩位數)
Discover Resources
ex 5
Ex5C#12
Angle of elevation and Angle of depression(仰角和俯角)
以 Unit Circle 了解 Sine 的正/負的副本
圆周长演示
Discover Topics
LCM and GCD
Trapezoid
Sine
Frequency Distribution
Trigonometry