1) When all the angles are added up, they will be equal to 180°, which makes it supplementary angles
180 = 52 + b + 23
180 = b + 75
180 (-75) = b + 75 (-75)
b = 105°
2) These two angles are opposite of each other, and would be the same measurement, because they are vertical angles
128° = 128°
3) These angles, when added together, will equal 90° (note the box). This means that they are complementary angles.
56 + d = 90
d + 56 (-56) = 90 (-56)
d = 90 - 56
d = 34°
hope this helps
