Question

Abcd is a trapezium in which ab ||dc and a=b =45°.find angle c and d of the trapezium

Answer 1

d=180°-45°[co-interior angles]
=135°
similarly c=135

Answer 2

we know trapezium =360 degree
if a =b=45 degree then,
a+b+c+d= 360
45+ 45 +c+d= 360
90 + c+ d= 360
then equate