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Direction Cosines and Direction Ratios — Maths STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceMathsDirection Cosines and Direction Ratios2 Marks
Question
Write the distance of the point (3, −5, 12) from X-axis?
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Answer

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

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