alleryStart learning →The line r = a + λb is perpendicular to the plane r · n = d if and only if
Ab · n = 0
B|b| = |n|
Ca · n = d
Db × n = 0
Answer & Solution
Correct answer: D. b × n = 0
A line perpendicular to the plane runs along its normal, and collinear vectors have a zero cross product.
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