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= (-1,4,-2) - (2,-1,-1)
= (-3,5,-1)
vektor AC = C - A
= (5,0,-3) - (2,-1,-1)
=( 3,1,-2)
proyek AB pada AC
= (|AB| . |AC| / √|AC²|) * |AC|
=( (-3,5,-1) * (3,1,-2) / √ ( 9 + 1 + 4) ) * (3,1,-2)
=((-9+5+2)/√14) * (3,1,-2)
= (-2/√14) * (3,1,-2)
= ( -√14/ 7) * (3,1,-2)
= ( -3√14/7, -√14/7, 2√14/7)