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∠3 and ∠5
(iii) Alternate exterior angles
∠1 and ∠7
∠2 and ∠8
(iv) Interior angles on the same side of the transversal
∠4 and ∠5
∠3 and ∠6
Note: Interior angles on the same side of the transversal are also referred to as
consecutive interior angles or allied angles or co-interior angles.
Relation Between the Angles when Line ‘m’ is parallel to Line ‘n’:
Properties of Parallel Lines
(i) If a transversal intersects two parallel lines, then each pair of corresponding angles
are equal.
i.e., ∠1 = ∠5, ∠2 = ∠6 and ∠4 = ∠8, ∠3 = ∠7
(ii) If a transversal intersects two parallel lines, then each pair of alternate interior angles
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