Write a function areaperim that will calculate both the area and perimeter of a polygon. The radius r will be passed as an argument to the function. If a second argument is passed to the function, it represents the number of sides n. If, however, only one argument is passed, the function generates a random value for n (an integer in the range from 3 to 8). For a polygon with n sides inscribed in a circle with a radius of r, the area a and perimeter p of the polygon can be found by