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外心的位置
Author:
謝定原
GeoGebra
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四邉形 (四年級) 教師版
拼砌四邊形
兩位數除以一位數（一）
判斷球體
畫出對稱圖形
Discover Resources
垂直線的斜率關係
因數的判別
Pythagorean Theorem Proof: Shearing
平行四邊形的特性
推移矩陣（y 方向）
Discover Topics
Unit Circle
Linear Equations
Logic
Continuity
Frequency Distribution