### Video Transcript

Work out the value of đť‘Ą in the
figure.

First of all, letâ€™s think about
what we can say about these lines. We have two parallel lines cut by a
transversal, and here are the two angles weâ€™re considering. Theyâ€™re on the same side of the
transversal and theyâ€™re in the same position at either intersection, which means we
call them corresponding angles. And when two parallel lines are cut
by a transversal, corresponding angles are congruent, and therefore đť‘Ą must be equal
to 72.