Lines are 1-d and so are points
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A geometric figure is a shape like a square or rectangle and it can be used in different views like 3D, 2D and 1D would be just a line. So there is your answer!
1D figures are important in the real world because if we did not have 1D figures, the we wouldn't be able to make 2D and 3D figures.
no
Me
1D