Question

You need to construct a regular polygon. When you draw two sides, the interior angle created between them is 120°. What will be the sum, in degrees, of the measures of the interior angles of this polygon when it is completed?

Answer 1

angle sum property = ( n-2)*180

if 2 of his sides made 120

so

3rd side will be 60

as in only equilateral triangle all sider are 60

60+60+60=180