Problem 748. Wrapping the Tower of Pisa
The famous artist Christo Vladimirov Javacheff, who likes pizza, wants to wrap the well-known Italian tower in paper. It is a circular tower with radius s [m] and height a [m] and he decided to neglect the fact that it was leaning. How many square meters of paper should he bring as a minimum? Don't forget the top, although it is not so nice!
Note: inspired on problem 167