a I need some one to help me to answer the Q

Use a Mohr diagram to find the magnitudes and orientations of a1 and 02 from known normal and shear stresses ON and as, respectively, on two perpendicular planes P and Q The known stresses on each plane are: ON 220 MPa and as 110 MPa Plane P: Plane Q: ON-120 MPa and os 110 MPa