# Parametric equations for conic sections

• December 8th 2008, 04:09 PM
emetty90
Parametric equations for conic sections
How would I go about solving this:
Find parametric equtions for the conic section x^2+y^2-9=0
Thanks(Happy)
• December 8th 2008, 04:18 PM
mr fantastic
Quote:

Originally Posted by emetty90
How would I go about solving this:
Find parametric equtions for the conic section x^2+y^2-9=0
Thanks(Happy)

$x^2 + y^2 = 9$ is a circle of radius 3 and centre at the origin. The standard parametric equations in this instance are therefore $x = 3 \cos t$ and $y = \, ....$