1. ## Do you know??

IF endpoints A(-7-1) and B(5,5)

How do you determine the equation of the circle passing through AB.

Need help with this, I can fiqure this out. Which equation do I use and what would the answer be.
Joanne

You can first use the mid-point formula to find the center of the circle:

midpoint formula says:
$\displaystyle \frac{x_1+x_2)}{2} = h$ (x coordinate of center of circle)
and you do the same for your k (y coordinate) with the y coordinates of the given points.

$\displaystyle \frac{-7+5}{2} = h$
$\displaystyle \frac{-1+5}{2} = k$