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讀磅練習（公斤和克）
Author:
Anthony Or 柯志明
GeoGebra
New Resources
球体的体积推导
異分母分數減法
四邉形 (四年級) 教師版
判斷球體
兩組對邊相等和有直角的四邊形
Discover Resources
題四
Copy of 固定周界的長方形的面積變化
勝者即正義，可愛即正義～(可用Ctrl+滑鼠滾輪放大界面)
半圓上的圓周角
Interesting Geometric Theorem
Discover Topics
Polynomial Functions
General Quadrilateral
Hyperbola
Triangles
Reflection