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

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.

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.

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

Alternate interior angles between parallel lines are equal

If a transversal intersects two parallel lines, then prove that each pair of alternate interior angles is equal.

If two parallel line are cut by a transversal then alternate exterior angles are not equal.

If two parallel lines are cut by a transversal, then the alternate interior angles are equal

Theorem 6.2 : If a transversal intersects two parallel lines, then each pair of alternate interior angles is equal.

Theorem 6.2 : If a transversal intersects two parallel lines, then each pair of alternate interior angles is equal.

Fill up the blanks : If the pair of alternate Interior angles are equal, then the lines are ____.