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Angle in Alternate Segment 3
Author:
H.K.Leung
GeoGebra
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拼砌四邊形
兩組對邊相等的四邊形
三位數除以一位數（一）
柱體建築師
【案例】圆柱体内放置一个大球六个小球
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Circle123456789987654321
差的完全平方
三次函數圖形變化
蜘蛛網製作
弓形的滚动
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Secant Line or Secant
Root
Subtraction
Unit Circle
Numbers