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a. 180° - 10° = 170°
b. 180° - 137° = 43°
c. 180° - 153° = 27°
2)
a. 90° - 28° = 62°
b.90° - 45° = 45°
c. 90° - 75° = 15°
3)
a.
2a + a = 180°
3a = 180°
a = 60°
b.
b + 37° = 90°
b = 53°
c.
c + c + c = 180°
3c = 180°
c = 60°
d.
d + 95° + 135° = 360°
d + 230° = 360°
d = 130°
e.
e + 165° + 45° + 90° = 360°
e + 300° = 360°
e = 60°