Practicing Success
Practicing Success
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The lines with direction cosines l1, m1, n1 and l2, m2,n2 are perpendicular to each other if-
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l1.l2+ m1.m2+ n1.n2 = 1 l1.l2+ m1.m2+ n1.n2 = -1 l1.l2+ m1.m2+ n1.n2 = 0 l1.l2+ m1.m2+ n1.n2 = 1/2 |
l1.l2+ m1.m2+ n1.n2 = 0 |
The lines with direction cosines l1, m1, n1 and l2, m2,n2 are perpendicular to each other if l1.l2+ m1.m2+ n1.n2 = 0
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