Question

Distance between $(0,7)$ and $(-7,0)$ is _____

• A. $2\sqrt{7}$
• B. $7\sqrt{2}$
• C. $\sqrt{14}$
• D. $+1$

Answer 1

Answer: (B)

$7\sqrt{2}$

Distance $d$ between $(0,7)$ and $(-7,0)$ is given by $d=\sqrt{(0+7{)}^2+(7-0{)}^2}$
$\Rightarrow d=\sqrt{49+49}$
$\Rightarrow d=\sqrt{98}$
$\Rightarrow d=7\sqrt{2}$
Option $B$ is correct.