Answered: D1.3. The three vertices of a triangle… | bartleby

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D1.3. The three vertices of a triangle are located at A(6, −1, 2), B(–2, 3, −4),
and C(-3, 1, 5). Find: (a) RAB; (b) RAC; (c) the angle BAC at vertex A; (d) the
(vector) projection of RAB on RAC.
Ans. -8ax +4ay − 6az; −9ax +2ay + 3az; 53.6°; -5.94ax + 1.319ay + 1.979az

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We will first write the position vectors of the given vertices with respect to origin. This will help us to answer all the questions.

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