What is the measure of angle ABC ?
D A 30 40 20 10 170 0 180 160 150 50 130 60 140 20 110 100 120 B E 100 80 90 110 70 60 0 140 40 130 50 180 150 150 20 170 30 10 C
D A 30 40 20 10 170 0 180 160 150 50 130 60 140 20 110 100 120 B E 100 80 90 110 70 60 0 140 40 130 50 180 150 150 20 170 30 10 C