How to Find the Center and Radius of a Circle

Working with conic sections is algebraically intense. Use this video to remind learners of the process of writing a conic in standard form to aid in finding its key features. It explains the steps to writing a circle equation in standard form and then finds the center and radius. 

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CCSS: Adaptable
Instructional Ideas

  • Give learners a problem to complete while they are watching the video; they can stop or replay the video as often as needed
Classroom Considerations

  • Begin with a review of completing the square to prepare pupils for the video lesson
  • Requires Internet access to watch a YouTube video
  • The video is part of a 29-lesson series
Pros

  • Chunks the problems into manageable parts
  • Author uses sound terminology and clear explanations throughout the lesson
Cons

  • The lesson only includes one rather simple example
Common Core