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))

Correct?

Leaving me with an angle of 1.8925 Radians?

Is this all correct?