Questions in 3-d

Select	Question
	If the sum of the squares of the distance of a point from the three co-ordinate axes be 36,then its distance from the origin is
	The line joining the points $(-2,\,\,1,\,-8)$ and $(a,\,b,\,c)$ is parallel to the line whose direction ratios are 6, 2, 3. The values of $a,b,c$ are
	The direction ratios of the line joining the points (4, 3, –5) and (–2, 1, –8) are
	The co-ordinates of the point in which the line joining the points $(3,\,\ 5,\ -7)$ and $(-2,\,\ 1,\,\ 8)$ is intersected by the plane yz are given by
	The co-ordinates of a point which is equidistant from the points $(0,\,0,\ 0),(a,\,0,\,0),(0,\,\,b,\,\,0)$ and $(0,\,0,\,c)$ are given by
	The projection of the line segment joining the points (–1, 0, 3) and (2, 5, 1) on the line whose direction ratios are 6, 2, 3 is
	Points (1, 1, 1), (–2, 4, 1), (–1, 5, 5) and (2, 2, 5) are the vertices of a
	If ${{l}_{1}},\,{{m}_{1}},\,{{n}_{1}}$ and ${{l}_{2}},{{m}_{2}},{{n}_{2}}$ are the direction cosines of two perpendicular lines, then the direction cosine of the line which is perpendicular to both the lines, will be
	If a line makes the angle $\alpha ,\beta ,\gamma $ with three dimensional co-ordinate axes respectively, then $\cos 2\alpha +\cos 2\beta +\cos 2\gamma =$
	Perpendicular distance of the point (3, 4, 5) from the y-axis, is