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任何三角形內角和180度(五上數翰４－２)
Author:
陳民峰
GeoGebra
New Resources
兩組對邊相等的四邊形
錐體建築師
兩位數加法
判斷球體
異分母分數減法
Discover Resources
三平行線上作正三角形
glt-c02-10 六角柱旋轉
箭头平移动画
二次函數的圖像：頂點式
旋转的线段组成面
Discover Topics
Solids or 3D Shapes
Dilation
Vectors 3D (Three-Dimensional)
Median Value
Secant Line or Secant