0) { calc.x0.value = Xo; calc.y0.value = Yo; calc.z0.value = Zo; calc.r0.value = r; } else calc.r0.value = "Not a sphere";}// Calculate center and radius of sphere given four pointsfunction sphere(){ var i; var r, m11, m12, m13, m14, m15; var a = [[zero,zero,zero,zero],[zero,zero,zero,zero],[zero,zero,zero,zero],[zero,zero,zero,zero]]; for ..