If the magnitudes of two vectors a and b are equal then which one of the following is correct?

If the magnitudes of two vectos vec(a) and vec(b) are equal then which one of the following is correct?

If the magnitude of vec(a) xx vec(b) equals to vec(a).vec(b) then which one of the following is correct?

If the magnitudes of vec(a) xx vec(b) equals to vec(a). vec (b) , then which one of the following is correct ?

If the magnitude of sum of two vectors is equal to the magnitude of difference of the two vector, the angle between these Vector is

If the magnitude of sum of two vectors is equal to the magnitude of difference of the two vector, the angle between these Vector is

If the magnitude of sum of two vectors is equal to the magnitude of difference of the two vectors, the angle between these vectors is

If the magnitude of sum of two vectors is equal to the magnitude of difference of the two vectors , the angle between these vectors is

If the magnitude of sum of two vectors is equal to the magnitude of difference of the two vectors, the angle between these vectors is

If the magnitude of sum of two vectors is equal to the magnitude of difference of the two vector, the angle between these Vector is