Question

State whether the given statement is true or false

In a triangle, is it true $\frac{a}{\cos A}=\frac{b}{\cos B}=\frac{c}{\cos C}$, called as Cosine rule

• A. True
• B. False

Answer 1

The correct option is B False

Cosine rule is
$\cos A=\frac{b^2+c^2-a^2}{2bc},\cos B=\frac{a^2+c^2-b^2}{2ac},\cos C=\frac{a^2+b^2-c^2}{2ab}$