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GeoGebra
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斜率的值
直線的斜率：水平變化 & 鉛垂變化
平行線的斜率
多邊形的面積
圓的切線方程
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畫三角形 題3d
HKCEE-AM 2010 Q17 part a+b
图形动画3
直角三角形の三角比
「相似三角形」任务3的副本
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General Quadrilateral
Addition
Conic Sections
Logarithmic Functions
Ellipse