Condition for two perpendicular lines-

(a) m1 x m3 = – 1
(b) m1 x m2 = 1
(c) m1 = m2
(d) None of these

Anurag Mishra Professor Asked on 8th March 2016 in Maths.
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    Answer: (a) m1 x m2 = -1

    Anurag Mishra Professor Answered on 8th March 2016.
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