Answer: Trapezoidal prism
A figure with 4 sides and a parallel side is called a trapezoid, this is a 3 dimentional trapezoid which is called a trapezoidal prism.
It would be 31. 31 is a whole number. since 0.91 is close to 1. We would round it to 31 because of that.
The answer is 7.5 centimeters