Question

Find the measures of all angles formed by line a parallel to line b with transversal m, if one of the angles is 77°

Answer 1

77° and 103°

Explanation:

77° because it says one of the angles is 77°

103° because two parallel lines are equal to 180°

180°-77° is 103°

Answer 2

77° or 103°

Explanation:

All of the angles are either the given angle or its supplement. Corresponding angles are congruent, as are vertical angles. Any linear pair of angles will add to 180°.