Question

in quadrilateral abcd ,angleA +angleD =180. what special name can be given to this quadrilateral ?

Answer 1

since the adjacent angles are 180,

the quadrilateral is caleed cyclic quadrilateral

Answer 2

Trapezium because according to the information only one pair of lines are parallel
For parallogram two sides should be parralel
A + D =180
Thus sum of co interior angles is 180 only one pair of lines are parallel hence it is trapezium