Calculate the volume of a rectangular swimming pool that is 20.46 x 12.475 x 2.25

In order to find the volume of an object, you must multiply the length and the height and the width so I would say that the measurings you wrote are one of each. so you just multiply those and your answer is

574.286625

or rounded to the nearest tenth 574.29 and just add on what ever measuring units are a part of the problem.