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The angle between the two diagonals of a cube is
(a)
(b)
(c)
(d)

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Important Questions on Three Dimensional Geometry
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If D.R.'s of two lines are proportional to and , then acute angle between these lines is

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If the line joining the points and is parallel to the line whose direction ratios are , then are

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If the co-ordinates of the points be and , respectively, then the projection of on is

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The direction ratios of two lines are and . The lines are

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The direction cosines of two lines are and , 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 and are

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The direction cosines of a line that are perpendicular to the lines with direction ratios and are

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If be the angles which a line makes with the coordinate axes, then
