Points $A$, $B$, and $C$ are on a circle such that $AB = 8$, $BC = 15$, and $AC = 12$. Find the radius of the circle.
radius = 8*15*12 / 4*Area
radius = 1440 / [ 4 * sqrt [ 17.5 (17.5 - 8)(17.5 - 15)(17.5 -12) ] ] ≈ 7.53
+0 
