If 8R² = a² + b² + c², then triangle is
[A] Right angled [B] isosceles [C] Equilateral [D] none

Dear Nirabhra

Ans. is [A] Right angled triangle

As in right angle triangle suppose a and b are sides and c is hypotenuse

So a² + b² +c²=2c²

As we know in right angle triangle R is half of c

So

8R² = a² + b² + c²

All the best.

AKASH GOYAL

AskiitiansExpert-IITD

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