Define a parallelogram

A quadrilateral with its opposite sides parallel.

Four sided figure, with opposite sides parallel, but it does not have right angles.

I hope this helps. Thanks for asking.

A parallelogram is a four-sided polygon with opposite sides that are parallel and equal in length. It is a special type of quadrilateral where both pairs of opposite sides are parallel.

To determine if a given shape is a parallelogram, you need to check two conditions:
1. Opposite sides are parallel: You can calculate the slope of each pair of opposite sides using the coordinates of the vertices. If the slopes are equal, then the sides are parallel.
2. Opposite sides are equal in length: Measure the lengths of each pair of opposite sides. If they are equal, then the sides are congruent.

If both conditions are satisfied, then the shape is a parallelogram.