[(n-2)x180]/n=interior angle measure of any regular polygon
Above is the formula for finding the number of sides to a regular polygon. Because what you describe is not a regular polygon, an irregular, it is impossible to decipher what the amount of sides, therefore you have given everybody a trick question to answer. This leaves all answers before this null and void with inaccurate result. Also waltjhall has the wrong formula and obviously does not realize that you can never have a decimal in the number that n is equal to.