I proved that ||a+b|| = ||a-b|| if and only if a.b = 0
However the next part says using this explain why a paralleogram is a rhombus if and only if its diagonals are at right angles..
I can't figure this out?
I proved that ||a+b|| = ||a-b|| if and only if a.b = 0
However the next part says using this explain why a paralleogram is a rhombus if and only if its diagonals are at right angles..
I can't figure this out?