নিম্নলিখিত চিত্রে 'x' এর মান কত ?

F1 Suhani Madhuri 28.10.2021 D2

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HP JBT TET 2013 Official Paper
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  1. 60°
  2. 75°
  3. 80°
  4. 85°

Answer (Detailed Solution Below)

Option 1 : 60°
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HP JBT TET 2021 Official Paper
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Detailed Solution

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প্রদত্ত:

চিত্রটি হল = F1 Suhani Madhuri 28.10.2021 D2

ধারণা:

সম্পূরক কোণের সমষ্টি = 180° 

ত্রিভুজের সমস্ত অভ্যন্তরীণ কোণের সমষ্টি = 180° 

গণনা:

F1 Suhani Madhuri 28.10.2021 D3

⇒ ΔABC এ

⇒ ∠ADB + ∠ADC = 180° 

⇒ 108° + ∠ADC = 180° 

⇒ ∠ADC = 180° - 108° = 72° 

⇒ ΔADC এ

⇒ ∠ADC + ∠ACD + ∠DAC = 180° 

⇒ 72° + x° + 48° = 180° 

⇒ x° = 180° - 48° - 72° = 180° - 120° = 60° 

∴ নির্ণেয় উত্তর হল 60°

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