A polygon is a plane figure that has "at least three straight sides and angles," according to Oxford Dictionaries. However, polygons can have more than three sides; most have five or more. More »

The number of sides a regular polygon has is indicated by the name of the polygon. For example, a pentagon has five sides, and an octagon has eight sides. The fewest number of sides a polygon can have is three, but there... More »

A polygon that has all sides congruent is called a "regular polygon." Regular polygons must also have all angles congruent, which is a side effect of having congruent sides. For instance, a square must always have four 9... More »

A heptagon is a figure or polygon that has seven angles and seven sides. The sum of these seven interior angles has to equal 900 degrees. More »

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The polygon with 1,000 sides, 1,000 vertices and 1,000 angles is called a chiliagon or a 1,000-gon. The term "chiliagon," with a Greek-derived prefix meaning “thousand,” is a proposed name for the 1,000-sided, two-dimens... More »

A polygon with four sides and four angles is called a quadrilateral. Quadrilaterals are two-dimensional, closed shapes with angle measurements that add up to 360 degrees. More »

Unlike a regular shape, an irregular shape is a polygon with sides that aren't all equal and unequal angles. Some conventional geometric shapes, such as the rectangle, parallelogram and rhombus, are irregular. A rectangl... More »