Question 742072
Here is a bit of help.


Use midpoint formula for A and B.  That will be the center of the circle you want to find.  Use distance formula to find size of diameter or size of radius, depending on which points you choose.  You could choose points A and B for the distance formula, which will give you DOUBLE the radius.


Center based on midpoint of A and B:
{{{x=(-3+5)/2=1}}}
{{{y=(1+6)/2=7/2=3&1/2}}}


Size of Diameter:
If d = diameter, and r = radius,
{{{sqrt((-3-5)^2+(1-6)^2)=d}}}
you finish this for r.


Do you know what to do with the standard equation for a circle, {{{(x-h)^2+(y-k)^2=r^2}}}
?




(One hint: (h, k) is the center.)