What is the measures of an interior angle and an exterior angle of a regular decagon.

i need some

The interior angle is the supplement of he exterior angle
so interior+exterior=180 and
180-interior=exterior

the interior angle of a ngon is (n-2)/n times 180 degrees

decagon is 10 sided, 10gon
(10-2)/10 times 180=8/10 times 180=144 degrees

exterior=180-interior
exterior=180-144
exterior=36

interior angle is 144 degrees
exterior is 36 degrees