Interior angle of same side of transversal are
- Between lines i.e interior
- On the same side of transversal, i.e, either on left or on right
∠3 & ∠5 are interior angles on same side of transversal
∠4 & ∠6 are interior angles on same side of transversal
For parallel lines,
Interior angles on same side of transversal are supplementary
∠3 + ∠5 = 180°
∠4 + ∠6 = 180°