Question

Are the given vectors normal?
A=(5,-2) and B=(6,15)

Answer 1

\[\vec a • \vec b = |\vec a|| \vec b|\cos \theta = a_xb_x + a_yb_y = 0\]

if they are normal [because cos (pi/2) = 0]

Answer 2

thank you

Answer 3

ie if vectors a & b are normal [because cos (pi/2) = 0]