Circle and Sphere in OpenGL ES

In OpenGL ES 1.1 (using Objective-C), what is the easiest way to create a circle, and for a sphere? I would prefer for it to be easy to implement, as 开发者_运维问答I am new to OpenGL.

Thanks

jrtc27

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http://iphonedevelopment.blogspot.com/2009/05/procedural-spheres-in-opengl-es.html

That site has some fantastic basics tutorials for openGL ES too. Note: it's not an efficient way to do it, but since you asked for easy rather than efficient, you might be interested.