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CGP EDU Academic Team
Published on: August 12, 2026
If in Δ ABC, a 4 + b 4 + c 4 = 2a 2 (b 2 + c 2 ) then ∠ A is -
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(a, d)
a 4 + b 4 + c 4 = 2a 2 (b 2 + c 2 )
⇒ a 4 + b 4 + c 4 – 2a 2 b 2 – 2a 2 c 2 + 2b 2 c 2 = 2b 2 c 2
⇒ (b 2 + c 2 – a 2 ) 2 = 2b 2 c 2
⇒ b 2 + c 2 – a 2 = 
bc or – 
bc
⇒ 
= 
or – 
cos A = 
or – 
⇒ A = 45 0 or 135 0
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