Section 11 6 Conic Sections Ppt Video Online Download This is simply a circle of radius 4, centered at the origin (0, 0) The standard form for the equation of a circle is (xa)^2 (yb)^2 = c^2 where the center of the circle is the point (a,Precalculus Examples Popular Problems Precalculus Graph (x1)^2 (y2)^2=9 (x − 1)2 (y 2)2 = 9 ( x 1) 2 ( y 2) 2 = 9 This is the form of a circle Use this form to determine the center and Which graph represents (x-2)^2/16-(y+1)^2/9 1