Introduction to 3DEasy
Question
If direction ratio of two lines are a1,b1,c1 and a2, b2, c2 then these lines are parallel if and only if -
Options
A.a1 = a2, b1 = b2, c1 = c2
B.a1 a2 + b1 b2 + c1 c2 = 0
C.
D.None of these
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