Question

what is formula to find angle in any polygon when sides was given

Answer 1

If the angle is the internal angle, just divide 360 by the angle in degrees to get the number of sides of the regular polygon. If the angle is the external angle, add all the values of all the external angles. Equate the total value to (2n - 4)*90, and solve for n.

Answer 2

The interior angles of a regular polygon are each 120 degree.calculate the number of sides .The interior angles are 120 degree ,so the extirior angles are 180 degree - 120=60 degree.The exterior angles add up to 360 degree ,if we divide 360 deg by 60 deg we find their are 6 extiror angles.