Answer:
80
Step-by-step explanation:
You can find the measure of angle 6 two ways:
1) Angle 6 and the 80° angle are corresponding angles of two parallel lines cut by a transversal; therefore, they are congruent. m<6 = 80°
2) Angle 6 and the 100° angle form a linear pair, and the sum of their measures is 180°; therefore, m<6 = 80°
