How many sides a pyramid has depends on how you look at it. It actually has four sides, but if you're counting the bottom a pyramid has a total of five sides.
http://www.ask.com/webanswers/Science/Other/how_m...

there are 4 sides on a pyramid, and 5 faces. the four side faces and the bottom face.
http://wiki.answers.com/Q/How+man+sides+dose+an+py...

A triangular pyramid is a threedimensional shape. It looks like an ordinary pyramid, except that its base is triangular rather than square. It is also called a tetrahedron. It has
http://www.ehow.com/facts_6927887_manysidestrian...

There are 4 sides to a pyramid. These sides are triangles, generall...
http://www.chacha.com/question/howmanysidestoa...
