Question

Show that d is parallel to e​

Answer 1

It's Very Easy!

Let the lines be 'd' & 'e', & let 'b' be a transversal, then,

(Now you haven't named the lines, so it's kinda tough to explain.

See the part above 120 degree, it will be 60 Degree [Reason: Linear Pair])

Now, since, angle 60 = 60 [Alternate Interior Angles],

Therefore, line 'd' & 'e' are ||el

Hope that Helps (Actually I hope I was able to explain you)...