Trisect the segment BC and find BD to be one third of BC. Archimedes also showed how the spiral can be used to trisect an angle. Today, Shemtov's ties are sold in Japan; at Journal Standard's TRISECT, and online at Zozotown. State Highways 114 and 121 trisect Grapevine south and slightly west of downtown. Trisect has been an important religious center for Greek Orthodox Christians for a long time.