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1.
A parallelogram is constructed on the vectors 
, if 
and angle between 
and 
then length of diagonal of the parallelogram is
, if and angle between and then length of diagonal of the parallelogram is
2.
If 
, then 
is
, then is
3.
If 
and 
, then
and , then
4.
If the volume of the tetrahedron whose vertices are 
and 
is 11 cubic units, then 
and is 11 cubic units, then
5.
The vector 
is
is
6.
If 
and 
where 
and 
, then 
and where and , then
7.
is equal to
is equal to
8.
If 
and 
, then 
and , then
9.
If 
are any two non-collinear unit vectors and 
is any vector, then 
is equal to
are any two non-collinear unit vectors and is any vector, then is equal to
10.
The unit vector perpendicular to 
and coplanar with 
is
and coplanar with is