# Writing the Equation for a Circle

##### This Writing the Equation for a Circle lesson plan also includes:

Circles aren't functions, so how is it possible to write the equation for a circle? Pupils first develop the equation of a circle through application of the Pythagorean Theorem. The lesson then provides an exercise set for learners to practice writing the equation of a circle.

CCSS: Designed

##### Instructional Ideas

• Use floor tiles as a coordinate plane and have learners stand five units from the center to model the circle in Example One
##### Classroom Considerations

• The class should already be familiar with the Pythagorean Theorem and/or the distance formula
• Learners should also know how translations affect coordinate points
• The 18th installment of a 23-part module
##### Pros

• Teacher resource provides question prompts to help guide class membersto the equation of a circle
• Scaffolding tips give teachers ideas on how to help those struggling with the concept
##### Cons

• Resource only gives one example of writing an equation of a circle centered at the origin before quickly moving on to circles not centered at the origin