Geometry Terms

1. a fundamental statement that is accepted as true without proof
2. a pair of two angles who’s measures add up to 90 degrees
6. A triangle with three congruent sides
7. a flat, two-dimensional surface that extends infinitely in all directions and has no thickness. Contains at least 3
8. a straight, one-dimensional figure with no thickness that extends infinitely in both directions
9. a ray or line that divides an angle into two congruent (equal) parts
10. has a starting point but no end point.
11. A part of a line that has two endpoints
13. a logical argument that uses a series of statements, backed by definitions, axioms, postulates, or theorems, to demonstrate that a given geometric statement is true
14. the point where two rays or line segments meet to form an angle.

1. lines that would form a right angle if they crossed
3. a pair of two angles who’s measures add up to 180 degrees
4. an angle less than 90 degrees but more than 0 degrees
5. straight, coplanar lines that are always the same distance apart and never intersect
12. a statement that has been proven to be true using logical arguments based on previously established statements like axioms, postulates, and other theorems