Take into account that angle 4 is congruent to angle 3, and you have already calculated the measure of angle 3, which is 62°. Then:
m<3 = 62°
Angle 5 is congruent to angle 1, then:
m<5 = 60°
Internal angle of 62° and angle 6 are supplementary, that is, they add up 180°. Then, you have:
m<6 = 180° - 62° = 118°
Take into account that the sum of internal angles of a triangle is 180°. Then, for angle 7 you have:
m<7 = 180° - 62° - 58° = 60°
Angle 7 and angle 8 are supplementary, then:
m<8 = 180° - 60° = 120°
Angle 9 is congruent toangle 62°, then:
m<9 = 62°
Angle 10 is congruent to angle 6, then:
m<10 = 118°
Angle 11 is congruent to angle 8:
m<11 = 120°
Finally, angle 12 is congruent to angle 7:
m<7 = 60°