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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»

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.



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