How to Calculate Arc Length in 3D Sketch....

Please find attached 3D Sketch Names "Disctance Calculator"

i want to calculate the arc distance between each pair of Angles in give 3d Sketch......Please let me know if possible or GIve me mathimatical formula to manipulate by myseld when u have (x1,y1,z1) and (x2,y2,z2).

Best Regrds,

Aqeel

SolidworksGeneral