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畢氏定理證明（Ｉ）
Author:
林辰燁
GeoGebra
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兩組對邊相等的四邊形
【案例】2018年全国1卷理科12题
GeoGebra笔记功能体验课件
兩組對邊相等和有直角的四邊形
算柱 (兩位數)
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七巧板（tangram）
有趣的梯形面積問題
龜甲
Twghmkc_運動與我
Circle
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Trigonometric Functions
Reflection
Combinatorics
Derivative
Linear Programming or Linear Optimization