A circular area with a radius of 6.50 cm lies in the xy-plane

A circular area with a radius of 6.50 cm lies in the xy-plane. What is the magnitude of the magnetic flux through this circle due to a uniform magnetic field B = 0.230 T.

a) in the +z-direction;
b) at an angle of 53.1∘53.1∘ from the +z-direction;
c) in the +y-direction?