Find the flux of earths magnetic field of magnitude 500

Question

Find the flux of Earth's magnetic field of magnitude 5.00 x10^-5 T through a square loop of area 30.0 cm² for the following:

a) when the field is perpendicular to theplane of the loop.
b) when the field makes a 40.0°angle with the normal to the plane of the loop.
c) when the field makes a 90.0° angle with the normal to the plane.