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Q: .
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  • A. 60°
  • B. 75°
  • C. 90°
  • D. 45°
Correct Answer: Option B - a = 180°–(60°+45°) = 180°–105° a=75°
B. a = 180°–(60°+45°) = 180°–105° a=75°

Explanations:

a = 180°–(60°+45°) = 180°–105° a=75°