Question

Write the distance of the point (3, −5, 12) from X-axis?

Answer 1

$$\begin{gathered} \mathrm{The}\mathrm{distance}\mathrm{of}\mathrm{a}\mathrm{general}\mathrm{point}\left(x,y,z\right)\mathrm{from}x-\mathrm{axis}\mathrm{is}\sqrt{y^2+z^2}. \\ \therefore \mathrm{Distance}\mathrm{of}\mathrm{the}\mathrm{point}\left(3,-5,12\right)\mathrm{from}x-\mathrm{axis}=\sqrt{{\left(-5\right)}^2+{12}^2} \\ =\sqrt{169} \\ =13\mathrm{units} \end{gathered}$$