How do I create circles in CoD4 radiant?

[rufas1]

I only know how to make simple shapes like rectangles and triangles, but I'm clueless how to make circles. If there's a way to make circles, (Which there probably is,) I would be glad if somebody answered.

[Rezil]

I assume you mean cylinders. Two ways, either by going to Patch->Primitives->Cylinder which is the recommended way, or by going to Brush->Arbitrary Sided... and choosing the number of sides your cylinder should have. I suggest using the first method, and if you absolutely must use the second method choose a number that is a power of two(2, 4, 8, 16 etc.). This gives the best results for most cases.