Introduction to 3DEasy
Question
If < a, b, c > and <a′, b′, c′ > are the direction ratios of two perpendicular lines, then -
Options
A.a/a′ = b/b′ = c/c′
B.aa′ + bb′ + cc′ = 0
C.aa′ + bb′ + cc′ = 1
D.None of these
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