In the diagram, ∠ABC and ∠BCD are right angles, ∠BAD = t and ∠EDF = 70°. Find the value of t.

  • A 70°
  • B 165°
  • C 140°
  • D 110°

The correct answer is D. 110°

Vertically opp angles are equal âˆ CDE = 70°

Sum of interior angles in a quadilateral = 360°

(90 + 90 + 70 + t)° = 360°

t° = 360° - 250°

t° = 110°

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