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轨迹20
Author:
万超杰
GeoGebra
New Resources
sanjiaohanshu
兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
畫出對稱圖形
拼砌四邊形
Discover Resources
Floor plan area
Prism and Cylinder 2
Exploration of the conditions for congruent triangles.
转动中的杠杆
平方差公式的几何意义
Discover Topics
Set Theory
Numbers
Centroid or Barycenter
Circumcircle or Circumscribed Circle
Angles