# parallelogram

A parallelogram is a four-sided object that has parallel opposite sides. A square is a parallelogram. If you take the square and tilt it to one side, it’s still a parallelogram as long as its lines remain parallel.

A parallelogram is a two-dimensional object that you might have already encountered in geometry class. You can recognize a parallelogram by its parallel opposite sides, and also by its opposite angles that are equal. Adjacent angles on a parallelogram always add up to 180 degrees. If the angles of a parallelogram are 90 degrees, then it’s straight up and down, like a square or a rectangle.

Definitions of parallelogram
1. noun
a quadrilateral whose opposite sides are both parallel and equal in length
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Antonyms:
trapezium
a quadrilateral with no parallel sides
types:
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diamond, lozenge, rhomb, rhombus
a parallelogram with four equal sides; an oblique-angled equilateral parallelogram
rhomboid
a parallelogram with adjacent sides of unequal lengths; an oblique-angled parallelogram with only the opposite sides equal
rectangle
a parallelogram with four right angles
foursquare, square
(geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon
box
a rectangular drawing
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