What must be the contact area between a suction cup (completely exhausted) and a ceiling in order to support the weight of a 54.3 kg student? the acceleration of gravity is 9.8 m/s 2?

But it all comes from the equation of pressure: P = F / S 
P= Pressure, in Pascal, [P] 
F = Force, in Newton [N] 
S = Surface, in squared meters [S] 
Atmospheric pressure * area = weight 
101325 pascal * area = 54.3 pascal * 9.8 N
= 532.14 kg^2  converting this to m, it will be 0.0053 m^2