3D Geometric bodies

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Across
  1. 2. A round solid figure, or its surface, with every point on its surface equidistant from its centre.
  2. 5. A solid geometrical figure with straight parallel sides and a circular or oval cross section
  3. 6. A symmetrical three-dimensional shape, either solid or hollow, contained by six equal squares.
Down
  1. 1. A solid or hollow object which tapers from a circular or roughly circular base to a point.
  2. 3. A shape, or arrangement in the form of a pyramid.
  3. 4. A solid having four plane triangular faces; a triangular pyramid.