because for a 3d shape you use surface area which is the same except you calculate the area of each side and then add them together
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Area is a 2 dimensional quantity, finding it for something in three dimensions does not make sense. If you want to find an area-like quantity for 3 dimensional shapes, look into surface area, which is the area of each surface of the not flat shape.
There is no perimeter of a circle. Only flat shapes have perimeters. You can however, find the circumference, surface area, and volume.
Yes, but only if you divide the surface area of the plane by the legnth of it. Make sure to square your answer.
If the table is circular, then its circumference is 18.845 (rounded) If it's not a circle, then the circumference can't be calculated knowing only the area.
A 2D shape is flat and only has a surface area whereas a 3D shape is an object that has surface area and volume.