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正三角形在长方形边上移动加滚动
Author:
赵林
GeoGebra
New Resources
畫出對稱圖形
拼砌四邊形
柱體建築師
算柱 (兩位數)
三位數除以一位數（一）
Discover Resources
畢氏樹
refraction law
三角形的內心
Geometry : Basic Elements (幾何： 基本元素)
題 1
Discover Topics
Step Functions
Right Triangles
Exponent
Linear Functions
Sine