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Across 4. A quadrilateral with one pair of opposite sides parallel 5. A piece or part of a line having two endpoints 8. It is a three-dimensional, square-shaped figure 10. A four-sided polygon 12. The space between two lines that intersect 14. A polygon with all sides and all angles equal

Down 1. A polyhedron having a polygonal base and triangular sides 2. A triangle with two equal sides 3. One of several parts that fit with others to make a whole 6. Identical in shape and size 7. A round three-dimensional closed surface 9. A closed plane figure bounded by straight sides 11. A shape with a circular base and sides tapering to a point 13. A group of nearly parallel lines of electromagnetic radiation