Let $△PQR$ be a triangle. Let $\vec{a}=\vec{Q}R,\vec{b}=\vec{R}P$ and $\vec{c}=\vec{P}Q$. If $\left|\vec{a}\right|=12,\left|\vec{b}\right|=4\sqrt{3}$ and $b.c=24$, then which of the following is (are) true ?

Views: 893 students