Linking error

[ramesh_manian]

I have a method listed below that is in my implementation file. When I "Build and Go", XCode gives me a link error for this method. I am not sure what framework I need to add or perhaps if I am making a mistake in my method definition. It will be nice if someone can help with me in this.

- (float)distanceBetweenCGPoint)a andBCGPoint)b
{
return sqrt(pow((a.x - b.x), 2) + pow((a.y - b.y), 2));
}

Thanks....