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Yes, if it is bound by plane figures, just add the area of each plane figure. If it has a curved surface, divide it into many small pieces, to approximate the area with small rectangles or triangles, then add them up.
A cuboid, also known as a rectangular prism.
It could be considered one, but generally an hourglass figure is somebody with a small waist and even hips and shoulders. These measurements are also of a heavier person, so not everybody would consider it to be an hourglass figure.
If you used millimeters, the figure would be too large. If you used kilometers, the figure would be too small. Meters are just right.
An arc