Parallelograms Introduction

We are familiar with plane figures bounded by straight line segments as sides. They are known as Polygons.

Polygon is a word of Greek origin. It means figure with many angles implying many sides.

Squares, rectangles and other four-sided geometric figures formed by the union of four line segments are called Quadrilaterals.

Quadrilateral is a four-sided polygon.

Examples of quadrilaterals: