Hello
(n-2)*180 where n is the number if angles in a polygon
(38-2)*180
=36*180=6480
(29-2)*180=4860
1 angle -> 4860/29 = 167.58
You do the same here
(1026-2)*180=184,320
184,320/1026=179.64
They're complementary so 180-179.64=0.36°
(36-2)*180=6120
6120/36=174.85
180-175.85=5.15°