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and 
if their lengths are 
, 
, and the angle between the vectors is 
.
and 
if their lengths are 
, 
, and the angle between the vectors is 
.
and 
if their lengths are 
, 
, and the angle between the vectors is 
.
and 
are given, for which 
, 
apply, and the angle between the vectors is equal to 
. Draw the vector 
and calculate its length .
and 
are given, for which 
, 
apply, and the angle between the vectors is equal to 
.
