May 19, 2015

<p>Students complete the square in order to write the equation of a circle in center-radius form.<br/>Students recognize when a quadratic in x and y is the equation for a circle.</p><p>Teacher and Student versions of full lesson from engageNY</p>

- Mathematics > General
- Mathematics > Geometry

- Grade 9
- Grade 10

Reason abstractly and quantitatively.

Model with mathematics.

Use appropriate tools strategically.

Attend to precision.

Look for and make use of structure.

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.