# Parallelogram

## DEFINITION

A four-sided polygon, all opposite sides being parallel to each other. An equilateral parallelogram is called a rhombus.Also see geometric, mathematics, pantograph, parallelepiped, quadrilateral, rectangle, rhombohedron, square, trapezium, and trapezoid.<br><br>A four-sided polygon, all opposite sides being parallel to each other. An equilateral parallelogram is called a rhombus.Also see geometric, mathematics, pantograph, parallelepiped, quadrilateral, rectangle, rhombohedron, square, trapezium, and trapezoid.