OpenGL example programms

I just started with programming in OpenGL and I’m
looking for example programms with the following geometrical features: circle, rectangle, ball, cube, block, cone, cylinder etc. Where can I find such example programms? Thanks for your support.

Ulrich

http://www.sgi.com/software/opengl/examples/
http://nehe.gamedev.net/

or google for ‘OpenGL Examples’.