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A unit vector perpendicular to plane determined by the points (1,-1,2) (2,0,-1) and (0,2,1) is
Dear pallavui
poinys are given in a plane
so two vactor in that plane can be obtain
a= (2-1) i +( 0+1)j +(-1-2)k
= i +j -3k
and b= (0-1)i + (2+1) j +(1-2)k
=-i +3j -k
now a vector perpendicular to plane is r =a X b
for unit vector
r= (a X b)/|a X b|
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