A quadrilateral is plane figure bounded by four straight lines. The straight line joining the opposite corners is called its... Click here to read more

A parallelogram is a quadrilateral whose opposite sides are equal length and parallel. The diagonals of a parallelogram are unequal... Click here to read more

A plane figure bounded by four straight line segments is called an irregular quadrilateral. The area of any irregular quadrilateral... Click here to read more