ΔABC இல், ∠B மற்றும் ∠C இன் உள் இருசமவெட்டிகள் O இல் சந்திக்கின்றன. ∠BAC = 72° என்றால், ∠BOC இன் மதிப்பு:

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SSC CGL 2023 Tier-I Official Paper (Held On: 19 Jul 2023 Shift 2)
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  1. 110° 
  2. 126°
  3. 136° 
  4. 146° 

Answer (Detailed Solution Below)

Option 2 : 126°
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கணக்கீடு: 

 

∠BAC = 72° 

கோணத்தின் சொத்துத் தொகை மூலம்

⇒ ∠A + ∠B + ∠C = 180
 
⇒ ∠B + ∠C = 180 − 72 = 108
 
⇒ ∠OBC + ∠OCB = 54
 

கோணத்தின் இருசமவெட்டிகள் O இல் சந்திக்கின்றன

எனவே கோணத்தின் சொத்துத் தொகை மூலம்,

⇒ ∠OBC + ∠OCB + ∠BOC = 180

⇒ 54 + ∠BOC = 180

⇒ ∠BOC = 126

∴ சரியான பதில் 126°.

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