Question

8th one how to do it

Answer 1

Hey frnd , here is your answer
See, angle 2 + angle 3 = 180 degree. ( Co interior angles sum up to 180)

Now , angle 2 = angle 4 ( because alternative angles are equal) ........1)

angle 3 = angle 1 ( because alternative angles are equal)..........2)


Substitute 1) and 2) in above equation

So, angle 1 + angle 4 = 180 degree
Hope it helps!!!