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量角器
Author:
lahok.kolas
GeoGebra
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四邊形的特性
兩組對邊相等的四邊形
找出對稱軸
三位數除以一位數（二）
【案例】圆柱体内放置一个大球六个小球
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判斷球體 2
圓形墊圈 (Washer) 2
上下
Ext angle cyclic quad
三角函数求值 （单位圆、比值）
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Statistics
Quadratic Functions
Correlation
Equations
Incircle or Inscribed Circle