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

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

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

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=

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