Find the flux of the Earths magnetic field of magnitude 5.00 x 105 T through a square

Question:

Find the flux of the Earth’s magnetic field of magnitude 5.00 x 10–5 T through a square loop of area 20.0 cm2
(a) When the field is perpendicular to the plane of the loop,
(b) When the field makes a 30.0° angle with the normal to the plane of the loop, and
(c) When the field makes a 90.0° angle with the normal to the plane.