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半圆的滚动
Author:
孟宝兴
GeoGebra
New Resources
拼砌四邊形
直角坐標平面上的旋轉變換
兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
兩位數除以一位數（一）
Discover Resources
三角形外心-性質說明
Escher 階梯 (Penrose Stair)
翰林B4習p85_10
angles sum of a triangle 3
酷炫
Discover Topics
Perimeter
Trapezoid
Exponential Functions
Interest Calculation
Poisson Distribution