A quadrliateral (or quadrangle).
Number of vertices in the plane figure = 4.
It must have lines which meet at the four vertices, but they cannot cross.
There need not be any. If there is one (or more) it can by at any of vertex (or vertices).
A QUADRANGLE HAS 4 SIDES QUADRANGLE- QUAD MEANS 4
Quadrilaterals contain four line segments as well as four vertices where the lines meet. The four-sided object is also commonly referred to as a quadrangle.
The sum of the angles in a quadrangle is 360 degrees.
three
10
9
4
o