Here's a few formulae
Here's some formulae I found in my Engineering-in-Training Manual
Name, # of Faces, Form of Faces, Total Surface Area, Volume
tetrahedron, 4, equilaterial triangle, 1.7321 s^2, 0.1179 s^3
cube, 6, square, 6.0000 s^2, 1.0000 s^3
octahedron, 8, equilaterial triangle, 3.4641...