In the diagram above calculate the value of x

  • A 60∘
  • B 100∘
  • C 120∘
  • D 140∘
jamb 2005mathematics

The correct answer is C. 120∘

p + 40

= 100

(exterior ∠ = sum of two interior opp ∠s)

p = 100- 40

P = 60

But q + p = 180

(∠s on a straight line)

q + 60

q = 180- 60

q = 120

x = q (corresponding ∠)

∴x = 120

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