Question

Find the distance between the origin and P $(3,\sqrt{5},2)$.

Answer 1

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