Help drawing Mohr's circle with rotated axis

[Blugga]

Homework Statement

Plane stress in xy-plane. Use Mohr's Circle to find σ_x1 σ_y1 and τ_x1y1 if the XY axis is rotated counterclockwise θº

I want to do my HW problem myself so I'll just put some sample values. If i know how to get this one, i'll know how to do the HW problem(s).
(Units won't matter for this)

σ_x = -45
σ_y = -15
τ_xy = -20 which makes τ_yx = 20
θ = 100°

Homework Equations

τ_max=R
R = √((σ_x-σ_y)/2)²+τ_xy²
center=σ_ave= (σ_x+σ_y)/2

The Attempt at a Solution

center=σ_ave= {[(-45)+(-15)]/2} = -30
R=25
Point A (-45,-20)
Point B (-15,20)
Using my book (Gere 8th), i was only able to get this far. Not sure if this is on the right track or not, but I'm stuck at this point. Don't know how to continue...
How can I get σ_x1 σ_y1 and τ_x1y1 from here?

 

[Blugga]

Problem Solved. I did it all by myself!