Answer:
angle a = 97º
angle b = 83º (97º*2 = 194, 360 - 194 = 166, 166/2 = 83º)
angle c = 59º
angle d = 121º (59º*2 = 118, 360 - 118 = 242, 242/2 = 121º)
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a = 97° (corresponding angle with marked 97°)
c = 59° (corresponding angle with marked 59°)
b = 180° - 97° = 83° (linear pair)
d = 180° - 59° (c) = 121° (linear pair)
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