This math topic involves practicing how to derive the standard equation of a circle from a given radius. Each problem presents a circle's radius and asks to identify the correct circle equation from two choices. The equations are presented in the standard form \((x-h)^2 + (y-k)^2 = r^2\), where \(r\) is the radius of the circle, and \((h, k)\) represents the coordinates of the circle’s center. The topic focuses on understanding and applying the relationship between a circle's radius and its equation in a coordinate plane.

Work on practice problems directly here, or download the printable pdf worksheet to practice offline.