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Sagot :
Answer:
a. 27° + (2x° + x°) = 180° (linear pair)
27° + 3x° = 180°
3x° = 180°-27°
x° = 153°/3
x° = 51°
2x° = 2×51 = 102°
b. a° = 142° (vertically opposite)
c° + a° = 180° (linear pair)
c° = 180° - 142°
c° = 38°
i° = c° = 38° (vertically opposite)
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