Determine the number of segments of which a polygon is made of

[Azmain S. Raiyan]

The angles of the said polygon is in an arithmetic series. The smallest angle is 120° and the common difference of the angles are 5°. Determine the number of the arms the polygon has.

Ps: Simply writing an "how to" will be helpful.

 

[JayJay]

Do you know how to sum an arithmetic series? Do you know how to find the sum of interior angles of a polygon ? The two sums are equal so you can form an equation with unknown "n" the number of sides / angles.

 

[Azmain S. Raiyan]

Thanks you very much. Jazāk Allāhu Khayran