On triangles ABC satisfying a!2! + b!2! + c!2! = kR!2! / O. Bottema
On triangles ABC satisfying a!<SUP!>2!</SUP!> + b!<SUP!>2!</SUP!> + c!<SUP!>2!</SUP!> = kR!<SUP!>2!</SUP!> / O. Bottema