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Two angles (a + 31) and (b - 49o) are adjacent angles on a straight...

Mathematics
WAEC 1996
Two angles (a + 31) and (b - 49o) are adjacent angles on a straight line. Which of the following is true
  • A. a + b = 198o
  • B. a + b = 180o
  • C. a + b = 162o
  • D. a + b = 100o
  • E. a + b = 80o
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Correct Answer: Option A
Explanation
a + 31 + b - 49 = 180o(sum of angles on str line)
a + b - 18 = 180o
a + b = 180 + 18
a + b = 198o
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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