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三節棍1060317
Author:
陳正鴻
GeoGebra
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四邊形的特性
找出對稱軸
異分母分數減法
【案例】2018年全国1卷理科12题
三位數除以一位數（二）
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Ratio of angles at the centre and the length of the arcs.
橢圓軌跡(兩同心圓)102.12.04
九點圓定理
zentangle
PTCCS2new2
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Circumcircle or Circumscribed Circle
Histogram
Sphere
Centroid or Barycenter
Pyramid