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unit circle for sin cos
Author:
王乐
GeoGebra
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三位數除以一位數（二）
兩組對邊相等的四邊形
找出對稱軸
【案例】圆柱体内放置一个大球六个小球
画直线等分三角形的面积
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Difference of Two Squares 平方差 (2)
面积与面积问题
No.3
Template: 對稱02
鉛筆畫圓
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Fractal Geometry
Poisson Distribution
Sequences and Series
Perimeter
Conic Sections