Yes, a polyhedron is only made up of one base which is bordered by straight lines. Each face is in fact a polygon, a closed shape in the flat 2-dimensional plane made up of points joined by straight lines.
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No, a polyhedron can have multiple bases. A base is a polygonal face that forms the bottom or top of the polyhedron, and there can be more than one base depending on the shape and symmetries of the polyhedron. For example, a prism has two parallel bases that are congruent polygons.
A tetrahedron.
Tetrahedron
It depends on which method of tag you are playing
a base
Tetrahedron