A point $P$ on a line is at a distance of 4 units from the origin $(0,0)$. If the line makes $60^{\circ}$…

A point $P$ on a line is at a distance of 4 units from the origin $(0,0)$. If the line makes $60^{\circ}$ with the negative direction of the $X$-axis, then $P$ is
  1. $(2,2 \sqrt{3})$
  2. $(2 \sqrt{3}, 2)$
  3. $(1, \sqrt{3})$
  4. $(2 \sqrt{3}, 1)$

Solution

$O P$ is perpendicular to given line.
$\therefore$ Slope of $O P=\frac{1}{\sqrt{3}}=\frac{y}{x} \Rightarrow x=\sqrt{3} y$ Also $x^2+y^2=16$ $\therefore 3 y^2+y^2=16 \Rightarrow y= \pm 2$ $\therefore$ Points can be $(2 \sqrt{3}, 2)$ or $(-2 \sqrt{3},-2)$.

Asked in: AP EAMCET 2022 (07 Jul Shift 2)

Practice more Straight Lines questions on Aicharya