त्रिभुज ABC में, BD ⊥ AC पर D पर लंब है और ∠DBC = 54° है। BC पर एक बिंदु E इस प्रकार है कि ∠CAE = 34° है। ∠AEB का मान क्या है?

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RRB Technician Grade III Official Paper (Held On: 29 Dec, 2024 Shift 2)
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  1. 80°
  2. 56°
  3. 78°
  4. 70°

Answer (Detailed Solution Below)

Option 4 : 70°
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दिया गया है:

त्रिभुज ABC में, BD, AC पर D पर लंब है और ∠DBC = 54° है। BC पर एक बिंदु E इस प्रकार है कि ∠CAE = 34° है।

प्रयुक्त सूत्र:

त्रिभुज के कोणों का योग = 180°

गणना:

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त्रिभुज BDC में, चूँकि BD, AC पर लंब है:

∠BDC = 90°

हमारे पास, ∠DBC = 54° है

तब, ∠BDC + ∠DCB + ∠DBC = 180°

⇒ 90° + ∠DCB + 54° = 180°

⇒ ∠DCB = 180° - 144°

⇒ ∠DCB = 36°

त्रिभुज AEC में, ∠CAE = 34°

तब, ∠AEB = ∠CAE + ∠DCB

⇒ ∠AEB = 34° + 36°

⇒ ∠AEB = 70°

अतः सही विकल्प 70° है।

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