Appendix B - Graphs of Equations - Exercises - Page 427: 36

Center = Origin (0, 0) and Radius r = 9 a) The center-radius form of the circle equation is $x^2$ + $y^2$ = $81$ b) Refer to Graph I for the graphing.

Center = Origin (0, 0) and Radius r = 9 a) The center-radius form of the circle equation is $x^2$ + $y^2$ = $9^2$ $x^2$ + $y^2$ = $81$ b) Refer to Graph I for the graphing.