Question

Assertion :Given in $△ABC,a:b:c=\cos A:\cos B:\cos C$.
$△ABC$ is equilateral. Reason: $\cos A=\frac{b^2+c^2-a^2}{2bc}$, $\cos B=\frac{c^2+a^2-b^2}{2ca}$, $\cos C=\frac{a^2+b^2-c^2}{2ab}$

• A. Assertion is True, Reason is True; Reason is a correct explanation for Assertion
• B. Assertion is True, Reason is True; Reason is Not a correct explanation for Assertion
• C. Assertion is True, Reason is False
• D. Assertion is False, Reason is True

Answer 1

The correct option is A Assertion is True, Reason is True; Reason is a correct explanation for Assertion