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鉛筆畫圓
Author:
30張婷淯
GeoGebra
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【案例】2013年安徽高考15题
球体的体积推导（优化版）
錐體建築師
画直线等分三角形的面积
畫出對稱圖形
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Venn diagram
平方根
旋轉扇形
拋物線五-包絡線法
平方求和V 庄皮春 (Pi-Chun Chuang)
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Secant Line or Secant
Straight Lines
Constructions
Standard Deviation
Trapezoid