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相同圖形的拼砌（有兩組平行線的四邊形）
Author:
ho ting chit
GeoGebra
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第八周作业
拼砌四邊形
【案例】圆柱体内放置一个大球六个小球
畫出對稱圖形
兩組對邊相等和有直角的四邊形
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combos ()
軌跡觀察---圓上正三角形中心軌跡
P6 圓周02D
Compare areas by cutting shapes Q2
quiz 9.1 2(d)
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Complex Numbers
Trigonometric Functions
Difference and Slope
Geometric Mean
Angles