Equation of a Circle Notes and Worksheets

These equation of a circle guided and worksheets cover:


  • The equation of a circle (with a picture to explain how the formula is derived from the Pythagorean Theorem)
  • Writing the equation from the center/radius and from a graph
  • Graphing
  • Determining if a point is on a circle
  • Writing the equation from the center and a point
  • Converting between general and standard form (completing the square, FOILing)

**I also included worksheets with the terms “center-radius form” and “standard form” for states using that vocabulary




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