Given in ABC, a : b : c = A : B : C. STATEMENT-1: ABC is equilateral. STATEMENT-2: A = b^2 + c^2 - a^2 2bc , B = c^2 + a^2 - b^2 2ca , C = a^2 + b^2 - c^2 2ab .

JEE Advanced Mathematics question

Not in JEE syllabus

Given in , . STATEMENT-1: is equilateral. STATEMENT-2: , , .

(A)Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1Correct
(B)Statement-1 is True, Statement-2 is True; Statement-2 is *Not* a correct explanation for Statement-1
(C)Statement-1 is True, Statement-2 is False
(D)Statement-1 is False, Statement-2 is True

Answer: (A)

**Statement-2:** Cosine rule. **True.** - **Statement-1:** . Substituting Statement-2:

= = ⇒ + -

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Question ID VK-110323