1.

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

Answer»


Answer :Hence,Direction COUSINE of `vec(AB)(-2)/(sqrt(17)),(-2)/(sqrt(17)),(3)/(sqrt(17))`
Direction cousine of `vec(BC)(-2)/(sqrt(17)),(-3)/(sqrt(17)),(-2)/(sqrt(17))`
Direction cousine of `vec(CA)(4)/(sqrt(42)),(5)/(sqrt(42)),(-1)/(sqrt(42))`


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