Question 596878
The supplement of an angle x is 180-x.  In trigonometry, we use {{{pi}}} for 180 degrees, so the supplement of x is {{{pi-x}}}.


The supplement of {{{(2pi)/3}}} is {{{pi-(2pi)/3}}} or {{{pi/3}}}.


Dr. Robert J. Rapalje, Retired
Professor of Mathematics
Seminole State College of Florida