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x+2y=180° (Sum of exterior angles)
2y=180°-x
y=180°-x/2
y=90°- x/2 [C]
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Answer:
Step-by-step explanation:
x+2y=180° (Sum of exterior angles)
2y=180°-x
y=180°-x/2
y=90°- x/2 [C]
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