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底圖為圓，截面為半圓

Author:羅驥韡 (Pegasus Roe)

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判斷球體
兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
近似值：有效數字
拼砌四邊形

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動態畢氏定理
高次函數圖形觀察
正四面體作業
三角形的外角等于与其不相邻的两个内角之和
旋轉+伸縮正多邊形

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Rational Numbers
Coordinates
Natural Numbers
Geometric Distribution
Vectors 3D (Three-Dimensional)

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