Property 3 The sum of the interior (or exterior) angles on the same sides of the transversal is `180^@`. In other words the interior (or exterior) angles on the same side of the transversal are supplementary.

Theorem 6.4 : If a transversal intersects two parallel lines, then each pair of interior angles on the same side of the transversal is supplementary.

Property 1 Pairs of alternate (interior or exterior) angles are equal.

If two lines are intersected by a transversal, then the number of pairs of interior angles on the same side of the transversal is

If a transversal intersects two parallel lines, then sum of interior angles on the same side of a transversal is _______

The ratio of two interior angles on the same side of the transversal is 2:3 , the measure of difference of both the angles is -

If two parallel lines are intersected by a transversal , then the interior angles on the same side of the transversal are -

If a transversal intersects two parallel lines, then alternate interior angles are on the _______ side of the transversal.

Theorem 6.5 : If a transversal intersects two lines such that a pair of interior angles on the same side of the transversal is supplementary, then the two lines are parallel.

Two parallel lines are cut by a transversal , then which of the following are true ? 1. Pair of alternate interior angles are equal. 2. Pair of corresponding angles are equal 3. Pair of interior angles on the same side of the transversal are supplementary.