[" (5.If "A(6,-6,0),B(-1,-7,6),C(3,-4,4)" and "D(2,-9,2)" be four points in "spar],[" show that "AB perp CD" ."]

If A (6,-6,0), B(-1,-7,6), C (3,-4, 4) and D (2,-9,2) be four points in space. Show that AB is perpendicular to CD.

If the co-ordinates of four points in space are A(6,-6,0), B(-1,-7,6), C(3,-4,4) and D(2,-9,2) then show that AB is perpendicular to CD.

If A(2, 3, 4), B(5, 4, -1), C(3, 6, 2) and D(1, 2, 0) be four points, show that vec(AB) is perpendicular to vec(CD) .

If A(4,8,12), B(2,4,6), C(3,5,4) and D(5,8,5) are four points, show that the lines vec(AB) and vec(CD) intersect.

If A(8,2,0),B(4,6,-7),C(-3,1,2)and D(-9,-2,4) are four given point then find the angle between vec(AB)and vec(CD) .

If A(1,2,3),B(4,5,7) ,C(-4,3,-6) and D(2,9,2) are four given points then find the angle between the lines AB and CD. a) (pi)/(6) b) (pi)/(4) c) (pi)/(3) d) 0

If A(1,2,3),B(4,5,7) ,C(-4,3,-6) and D(2,9,2) are four given points then find the angle between the lines AB and CD.