A way to directly see that the interior angles of triangle sum to 180°? – math.stackexchange.com

A way to directly see that the interior angles of triangle sum to 180°? – math.stackexchange.com

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I'm looking for a way to look at a triangle, and perhaps visualize a few extra lines, and be able to see that the interior angles sum to 180°. I can visualize that supplememtary angles sum to 180°. ...

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