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光源距離 Light Source Distance
Author:
W.L. Wong, Albert
GeoGebra
New Resources
直角坐標平面上的旋轉變換
畫出對稱圖形
判斷球體
算柱 (兩位數)
近似值：有效數字
Discover Resources
中點軌跡(動點在兩圓上)
兩外切圓之外公切線作圖法
線性變換矩陣（二階）
平行四邊形的面積
Testing 20170308
Discover Topics
Integral Calculus
Rotation
Angles
Tangent Line or Tangent
Rectangle