Find the equation of the line on which the length of the perpendicular segment from the origin to the line is 4 and the inclination of the perpendicular segment with the positive direction of x–axis is 30°.
Find the equation of the line on which the length of the perpendicular segment from the origin to the line is 4 and the inclination of the perpendicular segment with the positive direction of x–axis is 30°.

Given:

    \[p\text{ }=\text{ }4,\text{ }\alpha \text{ }=\text{ }30{}^\circ \]

The equation of the line in normal form is given by

On using the formula,

    \[x\text{ }cos~\alpha \text{ }+\text{ }y\text{ }sin\text{ }\alpha \text{ }=\text{ }p\]

Now, putting the values, we get

    \[x\text{ }cos\text{ }30{}^\circ \text{ }+\text{ }y\text{ }sin\text{ }30{}^\circ \text{ }=\text{ }4\]

    \[x\surd 3/2\text{ }+\text{ }y1/2\text{ }=\text{ }4\]

    \[\surd 3x\text{ }+\text{ }y\text{ }=\text{ }8\]

∴ The equation of line in normal form is:

    \[~\surd 3x\text{ }+\text{ }y\text{ }=\text{ }8.\]