For a right cylinder, this means that the solid will appear to be upright (not slanted or looking like it may tip over) when sitting on its base (not "oblique"). That is, the bases will be directly above one another when it is sitting on its base.
For a right cone, this means that the point (top, apex, vertex) of the cone will be directly over the center of the base (not slanted, nor leaning to the side). |
Right versus Oblique Solids
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