###
Triangle

A 3-sided figure

###
Quadrilateral

A 4-sided figure

###
Pentagon

A 5-sided figure

###
Heptagon

A 7-sided figure

###
Octagon

An 8-sided figure

###
Decagon

A 10-sided figure

###
Trapezoid

A quadrilateral with one pair of parallel sides

###
Parallelogram

A quadrilateral with 2 pairs of parallel sides

###
Convex Polygon

A polygon in which all of the diagonals lie in the interior of the polygon.

###
Concave Polygon

A polygon in which any point of a diagonal lies in the exterior of the polygon.

###
Diagonal

A segment connecting any two nonconsecutive vertices of a polygon

###
Polygon

A plane figure formed by a finite number of segments.

###
Regular Polygon

A convex polygon that is both equilateral and equiangular

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