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proof 64 潘研
Author:
郭亮偉
GeoGebra
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兩組對邊相等的四邊形
球体的体积推导（优化版）
四邉形 (四年級) 教師版
柱體建築師
判斷球體
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橢圓的軌跡
圆的面积 - 排列组合法
正方體組合
正四角錐兩側面夾角
圖二 的複本
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Trigonometric Functions
Linear Regression
Root
Complex Numbers
Rational Numbers