The alphabets stand for numbers in different bases. For example, 10 in base 12 would be A, 11 in base 12 would be B, and 12 in base 12 would be 10, and so on. 0D=D which is 13 in base 10, and 1D can be in many different bases.
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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
3d-3d cancel 2d-3d=-1d 8=-1d-17 -17+17 cancel 8+17=25 25=-1d 25/-1=-1d/-1 d=-25