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平行四邊形面積
Author:
Tong Wing Hong
GeoGebra
New Resources
四邉形 (四年級) 教師版
球體建築師
兩組對邊相等和有直角的四邊形
球体的体积推导（优化版）
判斷球體
Discover Resources
題二
近期新增圖檔
Copy of 二次函數圖形
魔术师的地毯
圓周_半圓內的半圓
Discover Topics
Trapezoid
Straight Lines
Linear Equations
Random Experiments
LCM and GCD