Answer:
#11
Complementary angles ad to 90°
#12
Alternate exterior angles are congruent
#13
Complete angle and angle addition postulate
- b = 360° - (244° + 23°) = 93°
#14
Vertical angles are congruent
#15
Complementary angles add to 90°. Straight angle is 180°
- b = (180° - 90°) - 39° = 51°
#16
Alternate interior angles are congruent