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The angle between the two diagonals of a cube is

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Important Questions on Three Dimensional Geometry

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If D.R.'s of two lines are proportional to 2, 3, -6 and 3, -4, 5, then acute angle between these lines is
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If the line joining the points -2,1,-8 and a,b,c is parallel to the line whose direction ratios are 6, 2, 3, then a, b, c are
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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 direction ratios of two lines are a, b, c and 1bc, 1ca, 1ab. The lines are
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The direction cosines of two lines are l1, m1, n1 and l2, m2, n2, then direction ratios of the line perpendicular to both lines are
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The direction cosines of a line perpendicular to lines whose direction ratios are 2, 1, -3 and 1, -2, 1 are
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The direction cosines of a line that are perpendicular to the lines with direction ratios 4, 1, 3 and 2, -3, 1 are