Across
- 6. a quadrilateral whose opposite sides are parallel and equal
- 9. a three-sided polygon
- 10. a parallelogram with four right angles
- 11. a polyhedron having a polygonal base and triangular sides
- 12. a way to measure the inside of an object
- 13. an angle between 90 and 180 degrees
Down
- 1. an angle less than 90 degrees but more than 0 degrees
- 2. being everywhere equidistant and not intersecting
- 3. the extent of a 2-dimensional surface enclosed within a boundary
- 4. a four-sided polygon
- 5. a triangle with one right angle
- 7. a polyhedron with two congruent and parallel faces
- 8. a line enclosing a plane area
- 12. the space between two lines or planes that intersect