###
open figure

any figure where at least one side does not meet

###
closed figure

any figure where all sides meet

###
polygon

any closed, flat figure with straight sides

###
triangle

any polygon with 3 sides and 3 angles

###
quadrilateral

any polygon with 4 straight sides

###
parallelogram

any quadrilateral that has opposite sides that are equal and parallel

###
rhombus

a parallelogram with 4 sides of equal length

###
square

parallelogram with 4 right angles and all sides are of equal length

###
rectangle

a parallelogram with 4 right angles and whose opposite sides are of equal lengh

###
trapezoid

a quadrilateral with 4 straight sides and 1 set of parallel lines

###
pentagon

a polygon with 5 sides and 5 angles

###
hexagon

a polygon with 6 sides and 6 angles

###
octagon

a polygon with 8 sides and 8 angles

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