Question

find the angle between the plane x+y-z=1 and x-3y+2z=1

Answer 1

Use the dot product the find the angle between the two normals of the planes.

Answer 2

so is <1,1,-1>*<1,-3,2>/|n1||n2|= -4/ sqrt 42?

Answer 3

Yes, now take the arccos of that quantity

Answer 4

or -4/6 sqrt 6=> -2/3 sqrt6

Answer 5

ArcCos=2.2

Answer 6

@JamesJ i just wanted to check my ans ty