Question

The slope of a line with inclination ${90}^{\circ }$ is:

• A. $0$
• B. $1$
• C. $\frac{1}{2}$
• D. Not defined

Answer 1

The correct option is D Not defined

Slope of a line with inclination $\theta$ is given by $\tan \theta$
Here, $\theta ={90}^{\circ }$

$\therefore$ Slope of the line with inclination ${90}^{\circ }$
$\tan {90}^{\circ }=\frac{1}{0}$ which is undefined.

Hence, option D is correct.