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Quadrilaterals

Any four-sided figure with straight edges.

Parallelogram - a four-sided figure that has two pairs of parallel sides. Opposite sides are equal in length, and opposite angles are equal as well.

Rectangle - a parallelogram with four right angles.

Rhombus - a parallelogram with four equal sides. See also, Rhombus Area Formula.

Trapezoid - a quadrilateral with one pair of parallel sides.

Kite - a quadrilateral with two pairs of sides that have equal length. The sides with equal length are adjacent to one another, rather than opposite as with a parallelogram.

Square - a rectangle that is also a rhombus. It has four equal sides and four equal angles with a measure of 90 degrees.

Pentagon - a pentagon is a five-sided polygon. A regular pentagon has five equal sides and five equal angles.

Hexagon - a hexagon is a six-sided polygon. See also, Regular Hexagon Area Formula.

Heptagon - a heptagon is a seven-sided polygon.

Octagon - an octagon is an eight-sided polygon. A stop sign is in the shape of a regular octagon since it has eight equal sides and eight equal angles.

Nonagon - a nonagon is a nine-sided polygon.

Decagon - a decagon is a ten-sided polygon.

Regular Polygon - having equal side lengths and equal angles at the vertices.

Convex Polygon - all vertex angles as measured from the interior are less than 180 degrees. Equivalently, all vertex angles measured from the exterior or greater than 180 degrees.

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