A 2-dimensional (plane) projection of a 3-dimensional (solid) figure.
Or, for polyhedra it could be a net but that answer would not be applicable to many 3-d figures.
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a flat object. Ex. a peice of paper, the paper is flat not 3d. not 3D.
yes it is however a rectangler prisom is 3d
area is the amount of space on a flat or 3d figure
If its 2d its called a semi-circle, if its 3d its called a semi-sphere.
A spiral is first defined as a flat figure. Sometimes it is used to describe a three dimensional case.