Polygon (Parallelogram/Pentagon/Octagon/Quadrilateral/Rectangle)

PARALLELOGRAM: A quadrilateral in which opposite sides are parallel.

PENTAGON: A polygon with five sides.

OCTAGON: An eight-sided polygon.

QUADRILATERAL: A polygon (simple closed figure) formed by four line segments.

RECTANGLE: A quadrilateral (polygon) with two pairs of parallel sides and four  right angles (4 sides and 4 square corners).  Illustration:

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