Plug the two points intoslope formula.

Plug the two points intothe Midpoint Formula.

How are perpendicular slopes related? Use this relationship to use the slope found above to find the perpendicular slope.

Then use the midpoint and this slope to findequation of the bisector. It would probably be simplest to start with the point-slope formula.

Solve the first equation for "t=", and plug this into the second equation. Simplify, and compare.

Follow the same procedure as above: find the midpoint, find the slope, find the perpendicular slope, and then find the line equation.

The two line equations form a system of equations.Solve the systemto find the intersection point, and thus the center.

Plug the center and any of the three given points on the circle intothe Distance Formula.

Plug the center (h, k) and the radius r into the center equation (x - h)^2 + (y - k)^2 = r^2.

If you get stuck, please reply showing how far you have gotten. Thank you!