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蝴蝶定理
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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兩組對邊相等和有直角的四邊形
柱體建築師
球体的体积推导（优化版）
錐體建築師
兩位數加法
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兩直線夾角101.11.21
中線定理(阿波羅尼奧斯)定理推廣一：斯圖爾(Stewart)定理
MathMedia150206
用極座標做時鐘的副本
圆锥截面为圆椭圆双曲线抛物线的动画显示.许兴华数学
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Kite
Trapezoid
Rectangle
Sequences and Series
Hyperbola