OpenStudy (anonymous):

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

2 years ago
OpenStudy (irishboy123):

\[\vec a • \vec b = |\vec a|| \vec b|\cos \theta = a_xb_x + a_yb_y = 0\] if they are normal [because cos (pi/2) = 0]

2 years ago
OpenStudy (anonymous):

thank you

2 years ago
OpenStudy (irishboy123):

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

2 years ago
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