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平面外積（有向面積）
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
New Resources
異分母分數減法
球體建築師
四邊形的特性
畫出對稱圖形
柱體建築師
Discover Resources
Angle Sum in a Triangle
P6 圓周03B
angle sum of polygon
外接圓的心
三角函数线
Discover Topics
Straight Lines
Upper and Lower Sum or Riemann Sum
Expected Value
Cube
Piecewise Functions