Triangle Names and Angle Sum (Interior and Exterior)

Thema:Gleichseitige Dreiecke, Gleichschenklige Dreiecke, Rechtwinklige Dreiecke, Allgemeine Dreiecke, Dreiecke

How to name triangles. The conditions for naming triangles. Proof the sum of interior (inside) angles = 180 deg. Proof the other two angles equal exterior angle.

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