The end points of the diameter of a circle are (-3, 2) and (5, -6). Find the center and radius of the circle. Write the general equation of this particular circle.
The radius is the midpoint of a diameter.
The equation for a circle is:
$\displaystyle \left(x-(\text{x-value of the center})\right)^2$$\displaystyle +\left(y-(\text{y-value of the center})\right)^2=\left(\text{the length of the radius}\right)^2$
So you need to find the coordinates of the center and the radius. Can you do the rest?