Equations of Circles: Finding the Equation of a Circle

This Equations of Circles: Finding the Equation of a Circle interactive also includes:

It's all about location and size. With the aid of the interactive, pupils explore the relationship between the location and size of a circle and its equation. The learners use that relationship to determine the equation of a circle given its center and radius and vice versa. Given an equation in standard form, users rewrite it in general form.

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CCSS: Adaptable
Instructional Ideas

  • Working in pairs, have one classmate graph a circle and the other determine the equation of the circle, then write it both in standard and general form
Classroom Considerations

  • Requires knowledge of squaring a binomial
  • Individuals using the interactive must sign up for a free CK-12 account

  • Includes feedback and hints for problems
  • The additional material provides extra examples and a problem set

  • Contains an incorrect coefficient answer in problem number three
Common Core