1. Center, Radius Form (x-h) + (y-k) = r (h,k) = Center r = radius
CIRCLE EQUATION
Center, Radius Form
(x-h) + (y-k) = r
(h,k) = Center
r = radius

2. What you will be able to do, knowing this equation:
1) Determine the center and radius of a circle
2) Write the equation of a circle
3) Sketch a circle

3. Find the center and radius of the following:1) 2) 3)

4. Write the equation of a circle, given the following:
1) Center(4,3) and radius = 5
2) C(-1,6) and r=2
3) C(-4,0) and r=

5. Sketching a Circle
You need to know the center(starting point) and the radius(distance from the center) AND Plot 4 points from the center: up, down, left and right, then connect only the 4 points

6. Let’s try to sketch a circle, given the center and radius: