# Math Help - Parametric Equation

1. ## Parametric Equation

Question :- Find the radius of parametric equation of the circle for the given x = 5 sin t and y = 5 cos t where 0 < t < pi ?

2. ## Re: Parametric Equation

Square and add the parametric equations, apply a Pythagorean identity to eliminate the parameter, and you will have a Cartesian equation from which you should immediately recognize the radius.