Interior angles in a triangle add up to 180˚. Triangles close triangleA polygon with three straight sides. have three sides, therefore they have three angles. Interior angles in a triangle sum to a ...

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This is a preview. Log in through your library . Abstract Let $\Delta A^1A^2A^3$ be a triangle with vertices at $A^1, A^2$ and $A^3$. The process of "bisecting ...