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Author:
陳科旭
GeoGebra
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找出對稱軸
兩組對邊相等的四邊形
球体的体积推导（优化版）
第八周作业
拼砌四邊形
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圓內接四邊形 ABCD ...，求 sinθ=?
尺規作圖髒髒版
vbvbvbvc
重心軌跡
【案例】圆柱体内放置一个大球六个小球
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Exponent
Parabola
Reflection
Conic Sections
Multiplication