geometry

5. two end points and all the points in between them
7. lines that meet at 90
9. is the measure of the amount of space inside of a solid figure, it is measured in cubic units.
10. is a line with a single endpoint (or point of origin) that extends infinitely in one direction.
11. the sum of two angles whose measure is 180
12. four parts of the coordinate plane
15. point in common of two rays that form an angle
16. is the length of a line segment from its center to its perimeter.
18. the middle point of the line segment

1. is the distance around the circle. It is the circle's perimeter.
2. the set of all points collinear to two points
3. an angle whose measure is greater than 90 and less than 180
4. the sum of two angles whose measure is 90
5. The total area of the surface of a three-dimensional object, measured in square units.
6. points on the same line
7. The distance around a two-dimensional shape.
8. points that lie on the same plane
13. two angles with a common side but no common interior points
14. point where the x-axis and y-axis meet in a coordinate grid
17. angle whose measure is less than 90