# Find Rectangular,Parametric, and Polar functions for this circle?

• May 1st 2008, 08:36 PM
bilbobaggins
Find Rectangular,Parametric, and Polar functions for this circle?
The circle has a center of (-2,3) and radius of 4. Find 3 equations.
1.rectangular
2.parametric
3.polar
• May 1st 2008, 08:54 PM
o_O
1. Recall the equation of the circle: $(x-a)^{2} + (y-b)^{2} = r^{2}$
(a,b) represents the centre of your circle (note the negative signs) and r (not $r^{2}$) is your radius.

2. Parametric form is given by: $\begin{array}{ll} x = r\cos \theta + a \\ y = r\sin \theta + b \end{array}$