Question

For the vectors $\overset{\rightarrow}{a}$ and $\overset{\rightarrow}{b}$ shown in figure$\overset{\rightarrow}{a}$ = $\sqrt{3}\widehat{i} + \widehat{j}$ and |$\overset{\rightarrow}{b}$| = 10 units while q = 23ŗ then the value of R = $\sqrt{a^{2} + b^{2} + 2ab\cos\theta}$ is nearly –

• A. 12
• B. 13
• C. 14
• D. 15

Answer 1

Answer: (B)

13

Answer 2

Use geometry to final $|\overrightarrow{a} + \overrightarrow{b}|$