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半圆的滚动
Author:
孟宝兴
GeoGebra
New Resources
異分母分數減法
兩位數除以一位數（二）
拼砌四邊形
四邉形 (四年級) 教師版
直角坐標平面上的旋轉變換
Discover Resources
三角形面積海龍公式
reflectional symmetry_5
圓與正方形中點軌跡1060317
五角星
圓心角
Discover Topics
Circumcircle or Circumscribed Circle
Square
Secant Line or Secant
Cuboid
Normal Distribution