Step-by-step explanation:
I took 3 indicated as 5 and its adjacent angle to be 3
<2 = <4
As <2 =<3( corresponding angle)
And <3 = <4 ( Vertically opp.angle)
hence <2 = <4
<2 =>110
so , <4 = 110
So, <4 =>110
As <4 and <5 form linear pair
So <4 + <5 =>180
<5 = 180 -110 =>70
As i took <5 as replacing angle to <3
So According to Question fig
<3 =>70
Hence proved