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Angle in Alternate Segment 1
Author:
H.K.Leung
GeoGebra
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兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
三位數除以一位數（二）
【案例】2013年安徽高考15题
球体的体积推导
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angles sum on a striaght line
银币
三角柱(可側轉、上下轉)
國旗
比例中的定值問題(二)
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Step Functions
Statistics
Percentages
Conditional Probability
Median Value