Given the points P1 = (2, 1, 6), P2 = (4, 7, 9), and P3 = (11,
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Question:
Given the points P1 = (2, 1, 6), P2 = (4, 7, 9), and P3 = (11, 7, −12).
(a) Find the vector with length 2 and has opposite direction to the vector −−→P1P2 .
(b) Show that the vector −−→P1P2 is orthogonal (perpendicular) to the vector −−→P1P3.
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