SIDE, ANGLE, VERTEX, , SIDE , ANGLE, VERTEX, , CONVEX POLYGON, CONCAVE POLYGON, , REGULAR POLYGON, IRREGULAR POLYGON, , HEXAGON, HEPTAGON, OCTAGON, , NONAGON, DECAGON, UNDECAGON, How many sides does a PENTAGON have?, 4, 5, 6, What is the sum of the interior angle of a TRIANGLE?, 180 degrees, 360 degrees, 540 degrees.

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