geometry puzzle

3. rays two rays that have a common endpoint and form a line
7. a flat surface that has no thickness and extends forever
12. the_____of a plane figure that is the sum of all sides
14. can be any side of a triangle
15. a point at one end that is the starting point of a ray
17. names a location and has no size
18. part of a line that starts at a endpoint and extends forever in one direction
19. angle formed by two opposite rays and measures 180 degrees
20. pair a_____of angles is a pair of adjacent angles whose noncommon sides are opposite rays

1. a straight path that has no thickness and extends forever
2. angles two angles that have the sum of 90 degrees
4. angles two angles whose measure has a sum of 180 degrees
5. angle measures less than 90 degrees
6. angles 2 nonadjacent angles formed by two intersecting lines
8. angle measures 90 degrees
9. a segment from a vertex that forms a right angle with a line containing the base
10. the___ of a plane figure is the number of non overlapping square units of a given size that exactly cover the figure
11. angle measures greater than 90 degrees and less than 180 degrees
13. angles ______are two angles in the same place with a common vertex and a common side
16. part of a line consisting of two segments