n = (p2-p1) x (p3-p2)
p1 =[0,1,1] p2 = [2,-1,2] p3 =[-3,1,0]
= [ 2,-2,1] x [-5,2,-2]
the answer is [2,-1,-6] but I can`t see how to get could someone show me please?
Frankly you notation is so poor as to make it impossible to follow.
If we have points then