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The value of x in the adjoining figure will be:
  • a)
    120°
  • b)
    90°
  • c)
    65°
  • d)
    80°
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The value of x in the adjoining figure will be:a)120°b)90°c)65...
∵ ∠DBC is the exterior angle for ∠DAB
∴ ∠ADB + ∠DAB = ∠DBC
⇒ ∠DBC = 25° + 55° = 80° 
∵ ∠x is an exterior angle for ∠EBC
∴ ∠EBC +∠ECB = x
⇒ 80° +  40° = x
⇒ x = 120°
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