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geometry - What's a proof that the angles of a triangle add up to 180°? - Mathematics Stack Exchange
![Properties of Triangle - types & formulas [Video & Practice]](https://cdn.e-gmat.com/blogs/wp-content/uploads/2019/07/Properties-of-triangle-Acute-angled-triangle.png "Properties of Triangle - types & formulas [Video & Practice]")
Properties of Triangle - types & formulas [Video & Practice]
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A triangle has sides A, B, and C. Sides A and B have lengths of 2 and 6, respectively. The angle between A and C is (pi)/4 and the angle between B
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Equilateral triangle - Wikipedia
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