In the figure, PQ is a parallel to ST and QRS = 40°. Find the value of x
 

  • A 55°
  • B 60°
  • C 65°
  • D 75°
jamb 1988mathematics

The correct answer is A. 55°

From the figure, 

3x + x - 40°= 180°

4x = 180°+ 40°

4x = 220°

4x = 220

x = \(\frac{220}{4}\)= 55°

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