Question

If m∠1 =63° , find m∠2 and m∠3 by calculation

Answer 1

Since ∠1 is 63 than ∠2 is 63 too because they are alternate interior. To find ∠3 you subtract 180 by the measure of ∠2 because both of these angles create a straight line.

180 - 63 = ∠3
117 = ∠3

Hope this helps :)