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1.
A variable plane is at a distance, 
from the origin and meets the coordinate axes in 
Then, the locus of the centroid of 
is
from the origin and meets the coordinate axes in Then, the locus of the centroid of is
2.
If 
are the angles which a directed line makes with the positive directions of the coordinate axes, then 
is equal to
are the angles which a directed line makes with the positive directions of the coordinate axes, then is equal to
3.
The 
-plane divides the line joining the points 
-plane divides the line joining the points
4.
The length of the perpendicular drawn from (1, 2, 3) to the line 
is
is
5.
The angle between the lines 
and 
, is
and , is
6.
Under what condition does a straight line does 
is parallel to the -plane?
is parallel to the -plane?
7.
The value of such that 
lies in the plane 
, is
such that lies in the plane , is
8.
The points 
and 
are
and are
9.
The foot of perpendicular from point 
in the plane 
is
in the plane is
10.
The length of perpendicular from 
to the line
to the line