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Squares, rectangles, pentagons, and hexagons are the polygons you should be familiar with for the GMAT.
A pentagon has 5 sides.
A hexagon has 6 sides.
The perimeter of a polygon is found by adding up the lengths of all its sides.
All polygons can be broken up into triangles to figure out the sum of degrees of all the interior angles of
a polygon.
Each triangle has 180° so this pentagon's interior angles add up to 3(180)° or 540°.
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