Question

If the two lines are perpendicular then difference of their inclination angle is ________

(a) 45°

(b) 60°

(c) 90°

(d) 180°

The question was posed to me in unit test.

This key question is from Various Forms of the Equation of a Line in chapter Straight Lines of Mathematics – Class 11

Answer 1

Right answer is (c) 90°

Explanation: If the two lines are perpendicular then if one line form angle α with positive x-axis then the other line form angle 90°+ α.