In quadrilateral ABCD, 
A + 
D = 180°. What special name can be given to this quadrilateral?
We know that,
Sum of co-interior angles is 180° in a trapezium
Hence, it is a trapezium.
5
In quadrilateral ABCD, A + D = 180°. What special name can be given to this quadrilateral?
We know that,
Sum of co-interior angles is 180° in a trapezium
Hence, it is a trapezium.