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0919 三角形面積
Author:
葉千岱
GeoGebra
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斜率的值
兩位數除以一位數（一）
球体的体积推导
直線的斜率
圓周公式的應用
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Trajectory of system: y'=sin(y)-y/2
長方體的表面面積
周界-平移法(練習一)
等邊三角形
正角、負角|Positive angles & Negative angles
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Percentages
Cube
Vectors 2D (Two-Dimensional)
Cosine
Arithmetic Mean