# Difference between Plain & Solid Geometry

1. Jan 10, 2004

### WannabeG133

I know this is probably the stupidest question asked, and you can flame me all you want for it, but what is the difference between Plain & Solid Geometry, Differential Geometry, and any others there might be? I'm a freshman in high school and we switch classes soon and I've got PS Geometry next term and just wondered what the differences were. Thanks for helping the uninformed stupid kid out.

2. Jan 10, 2004

One you didn't mention is Analytical Geometry, which is usually taught in the US these days in a combined class called precalculus. It is about how to set up coordinates and equations to describe curves and surfaces. The unit circle is described by $$x^2 + y^2 = 1$$.