$($b$)$ Show that the volumes of a cylinder and of a rect$$hngular box can be written in the form $V=Ah,$ identifying $A$ in each case. $($Note that $A,$ sometimes called the "footprint" of the object, can have any shape and that the height can, in general, be replaced by the average thickness of the object. Submit a file with a maximum size of $1$ MB$.)$