a flat object. Ex. a peice of paper, the paper is flat not 3d. not 3D.
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a 2d figure a square
a line is a 2D figure.
Any 2D figure. eg: Square, Circle, Rectangle, Octagon, Pentagon, etc.
No. A rectangle is a 2D shape, while a prism is a 3D figure.
Provided we are talking about a 2D figure with straight sides, it is an octadecagon.