In the given figure, O is the centre of the circle and ∠AOC = 140°. Find ∠ABC.

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SSC CGL 2022 Tier-I Official Paper (Held On : 07 Dec 2022 Shift 4)
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  1. 95°
  2. 110°
  3. 120°
  4. 103°

Answer (Detailed Solution Below)

Option 2 : 110°
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Detailed Solution

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Given :

O is the centre of the circle

∠AOC =140°

Calculation:

O is the centre of the circle

Take a point D in remaining arc

∠AOC = 140°

∠AOC = 2∠ADC ( Angle formed by chord at centre = twice angle formed in same arc segment)

⇒ 140° =  2∠ADC

⇒ ∠ADC  = 70°

ABCD will be  a cyclic quadrilateral

Sum of opposite angles of cyclic quadrilateral = 180°

⇒ ∠ABC + ∠ADC= 180°

⇒ 70° + ∠ABC = 180°

⇒ ∠ABC = 110°

Option 2 is the correct answer.

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