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外心的位置
Author:
謝定原
GeoGebra
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四邊形的特性
找出對稱軸
三位數除以一位數（一）
兩組對邊相等的四邊形
算柱 (兩位數)
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利用按扭製作控制動畫的開關
Locus of mid-point of a variable chord of a circle.
三角函數-sin
解題三
Trigonometric Ratios
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Polygons
Isosceles Triangles
Circle
Area
Optimization Problems