How to derivate the volume of a potato?

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In a project, we are asked to derivate the volume of a potato. In my mind, I thought of using summation, like cutting the potato into slices. So I'd calculate the area of the slice and multiply it by the width and sum all slices I cut together to get a complete, estimated Volume. However, should the width of the slices have the same length or is it completely ok if I use different lengths for the width?