Circumcircle of a triangle
This online calculator determines the radius and area of the circumcircle of a triangle given the three sides
Yet another triangle calculator, for those who needed radius of triangle circumcircle.
Radius can be found like this:
where S, area of triangle, can be found using Hero's formula
Calculator determines radius, and having radius, area of circumcircle, area of triange and area ratio - just for reference