Lesson Materials

## Lesson 6-2: Circles

Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and active in your browser (Click here to install Java now)

## Objective:

The student will be able to define a circle, graph a circle, locate its center and radius.

Modify the values of h, k and r, observe the changes and answer the following questions.

1. What are the coordinates of center A of the circle and the measurement of its radius? What is the equation of the circle?

2. What happens when we change the value of h into the equation of the circle ?

3. What are the coordinates of the y-intercepts of the circle? What happens if we replaced in the equation of the cicle with the y-intercepts? And if we replaced them by (3,2)? Which are the points whose coordinates fulfill the equation of the circle?

4. What is the equation of a circle with a center C(1,2) and radius r=5? And if the center is C(-5,2)? And if the center is (0,0)?

No hands-on yet

Livemath: An interactive website that explains the properties of circles. Livemath

No Puzzle yet