Question

The distance between the X-axis and the point $(3,12,5)$ is

• A. 3
• B. 13
• C. 14
• D. 12
• E. 5

Answer 1

Answer: (B)

13

The distance between the $x$-axis and point $(3,12,5)=$ Distance between $PQ$
$=\sqrt{(3-3{)}^2+(12-0{)}^2+(5-0{)}^2}$
$=\sqrt{0^2+{12}^2+5^2}=\sqrt{144+25}$
$=\sqrt{169}=13$