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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# 5 Pg.206
medial triangle
Geo Lab1
Фигура
Pi Made of Functions

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相似三角形
面積
分段函數
外接圓
正切線或正切

Coxeter- Exercise 2.3.2

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