**Title:** Going the Distance for Circles

**Description:**
This lesson is designed for an Advanced Mathematics class and introduces the first conic section - a circle. The definition and important information related to circles is presented in a multimedia presentation. Students are then required to document what they have learned in a brochure.
**Standard(s): **

[MA2015] GEO (9-12) 29: 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. [G-GPE1]

**Subject:**Mathematics (9 - 12), or Technology Education (9 - 12)

**Title:**Going the Distance for Circles

**Description:**This lesson is designed for an Advanced Mathematics class and introduces the first conic section - a circle. The definition and important information related to circles is presented in a multimedia presentation. Students are then required to document what they have learned in a brochure.

**Title:** Proof Without Words: Completing the Square

**Description:**
In this student interactive, from Illuminations, students carry out an interactive, geometric '' proof without words'' for the algebraic technique of completing the square. The page also includes directions and a link to the final solution.
**Standard(s): **

[MA2015] GEO (9-12) 29: 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. [G-GPE1]

**Subject:**Mathematics

**Title:**Proof Without Words: Completing the Square

**Description:**In this student interactive, from Illuminations, students carry out an interactive, geometric '' proof without words'' for the algebraic technique of completing the square. The page also includes directions and a link to the final solution.

**Thinkfinity Partner:**Illuminations

**Grade Span:**9,10,11,12