You can put this solution on YOUR website! You can do this on your own if you know how the three points of a triangle can be used to circumscribe the circle. You ask for (without specifically saying) the equation of the circle. Instead of going through the analysis and then the algebra steps, there is a good video I found showing constructing a circle circumscribed about a triangle. You may be able to figure what to do with your three given coordinate point values from that video . Then you need to use standard form equation of a circle.