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外心

Author:cloudyhsieh711

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Earth with coastline
找出對稱軸
判斷球體
四邊形的特性
近似值：有效數字

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空間三角形面積
Problem1:(md+me+mf)/(ad+be+cf)=a
摺紙模板
兩位數乘三位數直式
【案例】圆柱体内放置一个大球六个小球

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Volume
Cone
Statistical Characteristics
Statistics
Similar Triangles

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