Which solid figure has two parallel bases that are congruent circular discs?

Answer 1

There are many possible answers. Some of them are:

1. A cylinder;

2. A sphere, ellipsoid, double cone, an isosceles double paraboloid intersected by two parallel planes that are equidistant from the centre of major axis and, except for the sphere, perpendicular to it;

3. A torus (doughnut) cut in half be a vertical plane.