Graphing Circles & Parabolas

The unit we are currently studying in Analytic Geometry involves graphing circles and parabolas.  We have investigated the standard and general forms of both circles and parabolas.  We have graphed both using the different equations, and we have written equations of circles.  Writing equations of circles always comes down to finding the center and finding the radius.

Here's some places to investigate for further study and practice.  This first link is really cool if you are working with circles.

http://www.mathportal.org/calculators/analytic-geometry/circle-equation-calculator.php

https://www.youtube.com/watch?v=Im1qKj4nsqQ  (students: this is the video we looked at in class about what a parabola is, if you want to show it to your friends and family)

http://www.softschools.com/math/calculus/graphing_circles/

http://www.mathwarehouse.com/geometry/circle/equation-of-a-circle.php

http://study.com/academy/lesson/graphing-circles-identifying-the-formula-center-and-radius.html