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纏繞畫
Author:
洪源朗
GeoGebra
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拼砌四邊形
【案例】2018年全国1卷理科12题
算柱 (兩位數)
錐體建築師
球体的体积推导（优化版）
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直線之美
貝氏曲線
Apollonius Problem gergonne 2
畫鐘面的副本
伽利略比值II (Alfinio Flores & Hugh A. Sanders)
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Limits
Volume
Arithmetic Operations
Trigonometry
Numbers