if I construct a three sided polygon but the sum of it's interior angle is less than 180°, then what will it be called? A triangle? or is that impossible?
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Polygons with all interior angles less than 180° are convex; if a polygon has at least one interior angle greater than 180°, it is concave. Simple polygons do not cross their sides; complex polygons have self-intersecting sides. Polygons are all around you!
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