Question

Let vertex $A(2, 3, 1), B(3, 2, -1), C(-2, 1, 3)$. If $AD$ is angle bisector of angle $A$, then projection of $\overrightarrow{AD}$ on $\overrightarrow{AC}$ is equal to:

• A. $\frac{\sqrt3}{2}$
• B. $\sqrt{{\bigg(\frac{2}{3}}\bigg)}$
• C. $\sqrt{\bigg(\frac{3}{2}\bigg)}$
• D. $\frac{2}{\sqrt3}$

Answer 1

Answer: (B)

$\sqrt{{\bigg(\frac{2}{3}}\bigg)}$

Answer 2

The Correct Option is (B): $\sqrt{{\bigg(\frac{2}{3}}\bigg)}$