NCERT Exercise 11.1 Q5 - Three Dimensional Geometry

Question: Find the direction cosines of the sides of the triangle whose vertices are (3, 5, −4), (−1, 1, 2) and (−5, −5, −2).

Answer: AB: −2/√17, −2/√17, 3/√17; BC: −2/√17, −3/√17, −2/√17; CA: 4/√42, 5/√42, −1/√42 (or the opposite orientation).

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