Question

The distance between the origin and P $(3,\sqrt{5},2)$ is ___ units.

• A. $\sqrt{7}$
• B. $7\sqrt{5}$
• C. 7
• D. 8

Answer 1

The correct option is C

7

O$\equiv$ (0, 0), P $\equiv$ $(3,\sqrt{5},2)$

Using distance formula we have,

OP = $\sqrt{(3\sqrt{5}{)}^2+(2{)}^2}$

=$\sqrt{45+4}$

=$\sqrt{49}$

= 7 units