. A four sided polygon is called a
- Triangle: A triangle is a polygon with three edges and three vertices.
- Quadrilateral: A quadrilateral can be defined as a closed, two-dimensional shape which has four straight sides.
- Circle: A circle is a shape consisting of all points in a plane that are at a given distance from a given point, the center.
- Diagonal: A diagonal is a straight line connecting the opposite corners of a polygon through its vertex.
So, A four sided polygon is called a quadrilateral.
Hence, the correct option is B i.e. quadrilateral.