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A three-dimensional figure formed by six parallelograms.

3.

A solid having bases or ends that are parallel, congruent polygons and sides that are parallelograms.

5.

A figure, especially a closed plane figure, having three or more, usually straight, sides.

6.

A quadrilateral having both pairs of opposite sides parallel to each other.

7.

A quadrilateral plane figure having two parallel and two nonparallel sides.

9.

A parallelogram in which adjacent sides are of unequal lengths and angles are oblique.

10.

A surface or solid bounded by two parallel planes and generated by a straight line moving parallel to the given planes and tracing a curve bounded by the planes and lying in a plane perpendicular or oblique to the given planes.

Down:

1.

A polygon with four sides (or 'edges') and four vertices or corners.

4.

A quadrilateral whose four sides all have the same length.

5.

A geometric solid in three dimensions with flat faces and straight edges.

8.

A quadrilateral whose four sides can be grouped into two pairs of equal-length sides that are next to each other.