polygon, 2-D or plane shape with 3 or more sides, vertices & angles, pentagon, a polygon with 5 straight sides, 5 vertices & 5 angles, hexagon, a polygon with 6 straight sides, 6 vertices & 6 angles, octagon, a polygon with 8 straight sides, 8 vertices & 8 angles, triangle, a polygon with 3 straight sides, 3 vertices & 3 angles, quadrilateral, a polygon with 4 sides, 4 vertices & 4 angles, sides, straight lines of a shape, vertex (vertices), where 2 straight lines meet, angle(s), the corner of a shape, square, a polygon with 4 EQUAL sides, 4 vertices and 4 right angles, horizontal line, a straight line running from left to right, vertical line, a straight line running from top to bottom.

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