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1. A point charge of 1.84 microC is at the center of a cubical Gaussian surface 55cm on edge. Find [itex]\Phi_E[/itex] through the surface.

So here I was thinking, well the shape doesn't matter so the surface can be a sphere, so I calculated it for a sphere and it was correct (taking the radius as half of the edge).

But - how to do it for a square?

2. This one is related too - being "A point charge +q is a distance d/2 from a square surface of side d and is directly above the center of the square. Find the flux through the square".

More or less the same, solve with letters instead of numbers and divide by six. Again - how to do it without turning it into a sphere?