A three dimensional cube has a total of six faces. Each face is equal in length and width unlike a rectangle which also has six faces but two of them are smaller than the rest.
http://answers.ask.com/Science/Mathematics/how_man...

SQUARE. A square!
http://wiki.answers.com/Q/What_is_the_shape_of_fac...

1. Measure one edge of the cube. For an example, let one edge measure 5 inches. 2. Multiply the length to itself  5 inches multiplied by 5 inches equals 25 square inches. 3. Multiply
http://www.ehow.com/how_8630580_volumefivefaced...

I would assume the red face is F in that diagram, although there is no universal convention for how to draw the figure. The way to be sure, for a given source (website or whatever
http://www.quora.com/RubiksCube/WhichfaceisFi...
