Question

Find the measures of an interior angle and exterior angle of a regular 18-gon

Answer 1

interior angle : 160°

exterior angle : 20°

Explanation:

formular of interior angles of regular polygons :

((number of apexes-2)*180°)/(number of apexes)

examples :

triangle : (3-1)*180°/3=180°

square : (4-2)*180°/4=90°

back to our question :

interior angle : (18-2)*180°/18=160°

exterior angle = 180° - interior angle = 180°-160°=20°