Area
The amount of space taken up in a plane by a figure.

Parallelogram
Any quadrilateral with two pairs of opposite sides parallel.

Polygon
It is a closed plane figure with a least three straight segments as sides.

Perimeter of a polygon
The sum of the lengths of the sides of the polygon.

Quadrilateral
A four-sided polygon.

Rectangle
Any parallelogram that has 4 right angles.