What will be the angle between two vectors of equal magnitude for their resultant to have the same magnitude as one of the vectors?

The angle between the vectors i+j and j+k is

A parallelogram law helps to find the magnitude and direction of the resultant of two forces. If the magnitude of two vectors and their resultant are the same, what is the angle between the two vectors?

Write two different vectors having same magnitude.

Two collinear vectors having the same magnitude are equal ( true or false)