Here is a great video to assist you in starting your lessons on circles. We all know the standards have changed and this one specifically is a head ache due to the algebra 2 that is involved.
CCSS.Math.Content.HSGGPE.A.1 Derive the equation of a circle of given center and radius using the Pythagorean Theorem; complete the square to find the center and radius of a circle given by an equation.
Most of us have students that have not learned how to complete the square or even mastered basic algebraic proofs. Deriving the equation of a circle is impossible without being able to complete the square. Below is a great video on how to teach them this algebra lesson so you can teach this geometry standard.
Once you have reviewed / taught them completing the square. You then have to go into much more complex problems to get them to this level for the standard.
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125 Assignment  Circles in the Coordinate Plane (Members Only)
125 Bell Work  Circles in the Coordinate Plane (Members Only)
125 Lesson Plan  Circles in the Coordinate Plane (Members Only)
125 Guided Notes  Circles in the Coordinate Plane ( FREE )
125 Online Activities  Circles in the Coordinate Plane (Members Only)
125 Exit Quiz  (Members Only)
125 Slide Show Presentation  (Members Only)
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