prove that two non zero vectors A and B are perpendicular if and only if, |A|<|A+tB| for every number t.

Answer 1

A+tB is the diagonal of a parallelogram, right?
That diagonal has zero length only if A and B are perpendicular.

Answer 2

answer the question

Answer 3

I don't think so

Answer 4

I didn't know

Answer 5

To see the step of work