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正三角形

Author:: 陳幽靈

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有趣的梯形面積問題
其它
程自顺100
水位問題
Cuboid 長方體

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費式數列
Sum of exterior angles of polygon(多邊形的外角和)
錢幣換算
三角測量
Volumen ablesen 1

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Hyberbola
Geometric Transformations
Isosceles Triangles
Pyramid
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