In order to have a closed geometric figure composed of straight lines (Figure 1), the angles in the figure must add to (n - 2) (180 degrees) where n is the number of sides. (a) Write a program using the input function to define a value of n via a switch/case structure; then use n to calculate the sum of the interior angles in the figure. (b) Write a program that uses a menu so that a user can choose one of the following: Triangle Square Pentagon Hexagon Then use n to calculate the sum of the interior angles in the figure. Figure 1 * * ******************#*** * * *********END*********************** ** * * * * * * * *