We seek the plane passing through the points A 1 2 5 B 3 7 2 C 1 5 6 i Define position vectors a b c to the respective points A B C ii Construct displacement vectors AB b a and BC c b iii Use the cross product to find n the vector normal to the plane containing AB and BC iv What does the result in iii mean In particular what does the result mean in terms of being able to find the plane Find the plane through the pointer 125 12 2 79 1 5 6 and the additional paint 1