Answer:
(a) 97° + 125° + 85° + 115° + x = 540°
422° + x = 540°
x = 118°
(b) x + 3 + 13x - 33 = 180°
14x - 30 = 180
14x = 210
x = 15
Interior angle: 13(15) - 33 = 162°
Exterior angle: 15 + 3 = 18°
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