Question

In the figure show that AB||EF

Answer 1

Step-by-step explanation:

angle ABC=70

and angle DCB= (40+30)=70

means they are equal when this happens when AB is parallel to CD

so AB is parallel to CD

and ANGLE DCE=40

and angle FEC=140

so they are adding up-to 180 that means EC should be trasversel line and EF and CD are parallel

so CD is parallel to EF

but AB is parallel to CD

so AB is parallel to EF