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交錯弓形圓周角
Author:
+x sir
GeoGebra
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三位數除以一位數（一）
畫出對稱圖形
兩組對邊相等和有直角的四邊形
拼砌四邊形
【案例】2013年安徽高考15题
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圖二
抛物线的参数方程
F.1 Ch10.5 Transformation of Points on the Coordinate Plane
Similar triangles inscribed iteration
橢圓3--平行四邊形法
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Arithmetic
Triangles
Differential Equation
Intersection
Curve Sketching