The men didn't pay $29 because they only payed $27.........$25 was for the room and $2 was for the tip to the bellhop
Explanation- The room was originally $30, but they got a $5 meaning they only payed $25 and then they payed the bellhop $2 which equals to $27
27 (circumference) ➗ 3.14 (pi) = 8.59 (diameter)
Distance across (diameter) would be closest to 9.