Копие на Cylinder Volume and surface area

The volume of any cylinders is dependent on the height and the radius.
There are 24 cans of soda and they are arranged in 4 rows of 6. Each can has a radius of 4 cm and a height of 15 cm. These cans are to be packed snuggly into a case with no extra space on the top, bottom, or sides. Calculate how much empty space will not be occupied by a can in the box.