Types Properties of Quadrilaterals • Perimeter Area
A quadrilateral is a closed plane figure with four sides, these four sides form four interior angles. A general quadrilateral is shown in Fig. 2.51.
A diagonal of a polygon is a straight line segment joining any two nonadjacent vertices. The dashed line is one of two diagonals of the quadrilateral in Fig. 2.52.
A parallelogram is a quadrilateral in which opposite sides are parallel. In a parallelogram, opposite sides are ...