A decagon.
http://wiki.answers.com/Q/What_is_a_shape_with_10_...

A 2dimensional shape with 10 sides is a 'Decagon', a 10sided, 3d...
http://www.chacha.com/question/whatisashapewit...

A tetrahedron is one of the five Platonic solids, since it is a pyramid made up of four equal triangles. But a squarebottomed pyramid is not a tetrahedron, since it also includes
http://www.ehow.com/info_8510888_shapessidessqua...

Decagon is the shape or the polygon with 10 sides. It also contains 10 angles, 10 vertices, and 35 diagonals.
http://www.kgbanswers.com/whatshapehas10sides/...
