You don't say whether it is a 5 cm radius base and a 9 cm height or a 5 cm height and a 9 cm radius base. Which ever it is, just plug in the numbers, i.e., calculate
And just an "oh by the way" Pie is a food item, generally with a more or less flaky crust (depending on the skill of the preparer) and, when used as a dessert item usually contains a fruit or other sweet filling, or when used as a entrée or side dish generally contains some sort of savory filling. pi is the thirteenth letter of the lower case Greek alphabet representing the mathmatical constant that is the ratio between the circumference and the diameter of a circle.
My calculator said it, I believe it, that settles it