No, but they are labeled as not to scale if they are not to scale. Most of them are to scale.
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because otherwise it's not drawn to a consistent scale in all directions
It depends on the scale to which the map has been drawn. Not all maps are the same scale.
The circle doesn't fit because it is a curve. The other figures are drawn with line segments; they're polygons. In fact, the other figures are all quadrilaterals.
A tetrahedron, drawn to scale would be a two dimensional projection of a tetrahedron. It would be bigger or smaller than the original - depending on the scaling factor. It would comprise four points, no three on a straight line, in which all six pairs of points are joined together.
Not sure about geometry but the definition contains a redundant repetition.