A smooth closed curve.
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i dnt realli kno DIQHEADZ
A plane figure
NO. This is the way to get the volume of a prism, not the surface area of any three-dimensional figure. To find the surface area of a three-dimensional figure, you must find the area of each of its faces and then add the side-areas together.
2d is 2 dimensional so there is only length and width... edges are only in 3d and 2d figures only have one side...
Its a sphere.