Because normally, there is no way to do it directly.
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There is no general rule. There are different formulae for simple figures like a sphere, a cone and a cylinder. Other figures have yet other and more complex formulae.
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The first step is to figure out what shape the net will make when converted to 3-dimensions. Then, if you are lucky, there will be a suitable formula for finding the volume of such a shape.The first step is to figure out what shape the net will make when converted to 3-dimensions. Then, if you are lucky, there will be a suitable formula for finding the volume of such a shape.The first step is to figure out what shape the net will make when converted to 3-dimensions. Then, if you are lucky, there will be a suitable formula for finding the volume of such a shape.The first step is to figure out what shape the net will make when converted to 3-dimensions. Then, if you are lucky, there will be a suitable formula for finding the volume of such a shape.
That depends on the figure whose surface area and volume you're finding. You could try a Google search for "volume of [figure name]" or "surface area of [figure name]".