Question

the angles of a quadrilateral are 126 degrees 144 degree 54 degrees and 36 degrees prove that the two opposite sides of quadrilateral are parallel

Answer 1

if two opposite sides are parallel than opposite angles will be equal to 180
126+54= 180

Answer 2

In quadrilateral, 126+54=180

                         144+36= 180

These angles also form a co interior angle.

Therefore the 2 lines are parallel.