Across
- 3. a parallelogram with all of its sides the same length
- 9. a triangle having three acute angles
- 11. two nonintersecting lines which do not belong to a common plane
- 12. a convex polygon that is both equilateral and equiangular
- 13. a curve that ends at the same point it began
- 14. two nonintersecting lines belonging to a common plane
- 16. a rectangle with all sides of equal length
- 17. two angles whose sum of their measures is 180 degrees
- 19. a quadrilateral with exactly one pair of parallel sides
- 20. a simple closed polygonal curve
Down
- 1. an angle greater than 90 degrees but less than 180 degrees
- 2. an angle of measure 180 degrees
- 4. two angles that have a common side and nonoverlapping interiors
- 5. two angles whose sum of their measures is 90 degrees
- 6. angles measuring between 0 and 90 degrees
- 7. a pair of nonadjacent angles formed by two intersecting lines
- 8. a figure that contains the segment for each pair of point P and Q contained in the figure
- 10. a triangle having at least two sides of the same length
- 15. a simple closed surface formed from planar polygonal regions
- 18. a curve that never touches a point more than once