Geometry

1. parallelogram with consecutive sides congruent
4. triangle with all sides congruent
7. segments that have the same length
10. two angles whose sum is 180 degree
13. a point that divides the segment into two congruent segments
15. angle whose measure is 180 degrees
16. two coplanar angles with a common vertex and a common side between them
18. angle whose measure is greater than 90 degrees but less than 180 degrees
20. angle whose measure is 90 degrees
21. triangle with an obtuse angle

2. triangle with no sides congruent
3. line, ray segment, or plane that divides a segment into two congruent segments
5. angles that have the same measure
6. two angles whose sum is 90 degrees
8. the figure formed by three segments joining three noncollinear points
9. the non-adjacent angles formed by two intersecting lines
11. ray that divides an angle into two congruent adjacent angles.
12. triangle with a right angle
14. triangle with at least two sides congruent
17. angle whose measure is between 0 degrees and 90 degrees
19. triangle that has all acute angles