Coxeter- Exercise 2.3.2

主題：幾何

If three triangles are all perspective from the same center, then the three axes are concurrent. Let the three axes be D1E1, D2E2, D3E3. Then they are concurrent through D2.

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橢圓
正三角形
減法
三角函數
統計

Coxeter- Exercise 2.3.2

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