PQ is parallel to RS. Calculate the value of x.

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Mathematics JAMB 1979

PQ is parallel to RS. Calculate the value of x.

  • 20o
  • 40o checkmark
  • 60o
  • 80o
  • 100o

The correct answer is: B

Explanation

< D = 180º - 100º

= 80º (< on a str. line)

< S = 60º - alternate angle

x = 180º - (80º + 60º)

180º - 140º = 40º

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