The d in 3d stands for DIMENSION.
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A heptagon is a 2-d figure. There is not a 3-d counterpart.
3d + 8 = 2d - 7 3d -2d = -8 - 7 1d = - 15 d = -15
5d+3d = 15 8d = 15 d = 15/8 = 1.875
Ellipsoid. (An oval is a 2-d shape, NOT 3-d).
18-d3