[RadioAstronomer]

how does one find the dimensions of a circle? gee... pie times the raidus.... squared i think.... yes, it's squared. and becuase you use it, it is part of it. keep trying though, your attempt shows how long you've been out of school.

Pi * r² (pi times radius squared) or pi * d (pi times diameter)

Depends if you are looking for area or diameter. Once you understand Dimensional Analysis you will never get them confused again. Now it gets a bit tougher (not much :-)) if you are looking for the area of a paraboloid or hyperboloid like what I use in my work.

[MacDorcha]

excellent statement. yes, you can find them both that way. i must admit however, that i slept much of the parabola chapters, and didnt care for them in 9th grade. you may refresh me if you like. it only helps to know. (no, im not being asinine to you, please teach me, i forgot.)

[RadioAstronomer]

Depends if you are looking for area or diameter

Sigh! See what happens when you post late at night after a long weekend! :-(

Should have read circumference. (feel like a fool! LOL)