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sin(弳)
Author:
陳柄何
GeoGebra
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四邉形 (四年級) 教師版
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
球體建築師
兩組對邊相等的四邊形
Discover Resources
面積與積分值
釘版
三角形n邊形外角和
中位线的副本
自製工具：CurveFit, Bezier
Discover Topics
Division
Means
Pythagoras or Pythagorean Theorem
Centroid or Barycenter
Dilation