Measure of angle BAC Math.acos( (AC^2 + AB^2  BC^2) / (2*AC*AB) ) 

Measure of angle ABC Math.acos( (AB^2 + BC^2  AC^2) / (2*AB*BC) ) 

Measure of angle ACB Math.acos( (AC^2 + BC^2  AB^2) / (2*AC*BC) ) 

Measure of line segment AT (AB * AC) / (AB + BC) 

Measure of line segment XT Sqr(AT ^ 2 + AC ^ 2  AT * AC) 

Measure of angle ATX arcsin(AC / XT * 0.866) 

Measure of angle ATS pi / 2  ATX 

Measure of line segment AT / 0.866 * sin(ATS) 

Measure of line segment AC  AT 

Measure of angle CTS ATX 

Measure of line segment CS CT / 0.866 * sin(CTS) 

Measure of angle BAS arcsin(AZ / AB * 0.866) 

Measure of angle BAT Abs(pi / 3  BAS) 

Measure of line segment BS AB / 0.866 * sin(BAT) 

Length of Steiner Tree AZ + BS + CS 
