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ruler
Author:
felixchow
菱形
GeoGebra
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【案例】圆柱体内放置一个大球六个小球
兩組對邊相等和有直角的四邊形
四邊形的特性
拼砌四邊形
球體建築師
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滚动的硬币
坐標幾何（中一）
slopefield_spin
Angle at centre twice angle at circumference
变化的三角形的内心.许兴华数学
Discover Topics
Exponent
Definite Integral
Linear Programming or Linear Optimization
Natural Numbers
Indefinite Integral