Question

Angles made by the line with the positive direction of X–axis are given. Find the slope of these lines.
(1) 45° (2) 60° (3) 90°

Answer 1

(1) 45°
$m=\tan 45°=1$
Thus, slope = 1

(2) 60°
$m=\tan 60°=\sqrt{3}$
Thus, slope = $\sqrt{3}$

(3) 90°
$m=\tan 90°=\mathrm{undefined}$
Thus, the slope cannot be defined.