Answer:
1.
- Angle 2 = Angle 4 (alternate angles)
- Angle 1 = Angle 5 (corresponding angles)
2.
Angle 1 + Angle 2 + Angle 3 = 180 (angles on a line)
Now,
Angle 2 = Angle 4 (alternate angles)
and Angle 1 = Angle 5 (corresponding angles)
So,
Angle 1 + Angle 2 + Angle 3 = Angle 5 + Angle 4 + Angle 3 = 180
Hence proved
Explanation:
Hope this helps