Question 768093
SUPPLEMENTARY angles are angles which sum to 180 degrees.
COMPLEMENTARY angles sum to 90 degrees.  


You are asking for some angle, x, such that x+215=90.  Is this really what you want?  If so, then good.  Do it.
x+215-215=90-215
x=-125 degrees.  
(That is, negative 125.)


This would be a rotation of the unit vector on the unit circle clockwise by 125 degrees.