If `vecA+ vecB = vecC and A+B+C=0`, then the angle between `vecA and vecB` is :

If vecA+ vecB = vecC and A+B=C , then the angle between vecA and vecB is :

If veca+vecb=vecc , and a+b=c then the angle between veca and vecb is

vecA, vecB and vecC are vectors such that vecC= vecA + vecB and vecC bot vecA and also C= A . Angle between vecA and vecB is :

If veca +vecb +vecc =vec0, |veca| =3 , |vecb|=5 and |vecc| =7 , then the angle between veca and vecb is

If veca +vecb +vecc =vec0, |veca| =3 , |vecb|=5 and |vecc| =7 , then the angle between veca and vecb is

If veca+vecb=vecc and a+b=c , find the angle between veca and vecb .