Geometry Basic Definition

4. Points and/or lines that lie on the same plane.
5. An angle whose measure is 90 degrees.
8. Two (or more angles) with a sum of 90 degrees.
10. An undefined term, usually represented by a flat surface that extends on in all directions without end and has no thickness.
11. A part of a line that consists of two endpoints and all the points between the endpoints.
12. An angle whose measure is between 0 and 90 degrees.
13. An angle whose measure is between 90 and 180 degrees.
14. Two adjacent angles whose non-common sides form opposite rays.
15. A part of a line that consists of one endpoint and all the points on one side of the endpoint that extends forever in one direction.

1. Two different rays with a common endpoint.
2. An undefined term usually represents a dot that has no dimension or thickness.
3. The set of points that two or more geometric figures have in common.
6. Two (or more angles) with a sum of 180 degrees.
7. An angle whose measure is 180 degrees.
8. Points that lie on the same line.
9. Two angles that share a common vertex and side but have not common interior points.
14. An undefined term that is usually represents a straight path that goes in both directions and never ends.