3-d

Related Questions

• If a straight line in space is equally inclined to the co-ordinate axes, the cosine of its angle of inclination to any one of the axes is

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• If the co-ordinates of the points $A,B,C,D$ be (2, 3, –1), (3, 5, – 3), (1, 2, 3) and (3, 5, 7) respectively, then the projection of $AB$ on $CD$ is

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• The angle between the lines whose direction cosines satisfy the equations $l+m+n=0$, ${{l}^{2}}+{{m}^{2}}-{{n}^{2}}=0$ is given by

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• The value of k for which the planes $3x-6y-2z=7$ and $2x+y-kz=5$ are perpendicular to each other, is

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• If the length of a vector be 21 and direction ratios be 2, – 3, 6 then its direction cosines are

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