Classifying Polygons

polygon - a closed plane figure formed by 3 or more line segments

regular polygon - a polygon where all sides and angles have equal measures (such as an equilateral triangle, or a square)

trapezoid - a quadrilateral with only one pair of parallel sides
- a trapezoid

parallelogram - a quadrilateral with 2 pairs of parallel sides - all rectangles qualify as parallelograms. So do all rhombuses. So does this shape:
- a parallelogram

rectangle - a quadrilateral with 4 right angles. Squares qualify as rectangles.
- a rectangle

square - a quadrilateral with 4 congruent sides and 4 right angles.
- a square

triangle	a 3-sided polygon
quadrilateral	a 4-sided polygon
pentagon	a 5-sided polygon
hexagon	a 6-sided polygon
heptagon	a 7-sided polygon
octagon	an 8-sided polygon
n-gon	a polygon with an unknown number of sides	?

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