I need to find the angle between the planes x-z=1 and 2y+z=1
So the normal vectors for the planes would be
<1,0,-1) and <0,2,1) Correct?
And the magnitudes of those vectors would be
(2)^(1/2) and (5)^(1/2) Correct?
Thus Cos(Theta)= -1/((2^.5)*(5^.5))
Leaving me with an angle of 1.8925 Radians?
Is this all correct?