According to the Girard's theorem, where A is the triangle area, R is the radius of the sphere (it's the sphere because the sum of the angles is greater than 180°) and E = ∠A + ∠B + ∠C - . And, as I remember, curvature is the inverse of the radius.
According to the Girard's theorem, where A is the triangle area, R is the radius of the sphere (it's the sphere because the sum of the angles is greater than 180°) and E = ∠A + ∠B + ∠C - . And, as I remember, curvature is the inverse of the radius.