If you multiply the three numbers, you get the volume - assuming the tub has a "block" (rectangular) shape.
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Assuming that both the floor and the upper rim are exactly the same size and the walls surrounding the tub are straight in a vertical direction, the tub is a cylinder. Here is the equation: h * r^2 * pi Where h is the height of the tub, r^2 is the radius (half of the tub's diameter) squared, and pi is, of course, approximately 3.14
You are going to have to rethink this question. If a tub is 4 x 6 then it is rectangular, not round, yet you have described this as a diameter, which apples only to circles. You also have given no units of measurement. You might mean 4 inches by 6 inches, or 4 centimeters by 6 centimeters, or 4 feet by 6 feet, we have no way of knowing. And even then we still can't answer your question because volume is three dimensional, not two dimensional. We also have to know how deep this tub is, before we can calculate the volume.
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8*10*3 = 240 cubic feet.Each cubic foot = 28.317 liters (rounded)That's enough information to allow you to calculate the volume of the hot tub,in liters. We have no way to know now much water may or may not be in it.
To calculate the capacity (volume) of the tub, you multiply the area by the height. Area is pi x r-squared = 3.1416 x 10-squared = 3.1416 x 100 = 314.16. Volume = 314.16 x 14 = 4398.24 cubic inches. There are 1728 cubic inches per cubic foot, so you divide 4398.24 by 1728 = 2.5452777 cubic feet.