Precalculus Geometry of an Ellipse Standard Form of the Equation. Put in ab and r. Figure 1 is a circle with the center radius and diameter identified.
Find the Equation of the Circle 0-4 r6.
Use this form to determine the center and radius of the circle. The radius is typically denoted as r or R. Preview this quiz on Quizizz. Center-Radius form of the Equation of a Circle.