Geometry Unit 1 Vocabulary

1. the part of a conditional statement just after the word if
8. the point halfway between the endpoints of a line segment
10. angles whose angle measure is equal
11. part of a line between two points on the line, called endpoints of the segment
13. terms not formally defined and used to define other terms/concepts in a mathematical system
16. the study of plane and solid figures on the basis of axioms and theorems
18. determination of statement as either true or false
19. example used to disprove a statement
20. a straight one-dimensional figure that does not have a thickness, and it extends endlessly in both directions
21. a statement for which both the conditional and converse are true
23. the demonstration of a mathematical statement, true or false, using logic to arrive at a conclusion
25. the part of a conditional statement after then
26. words or terms used to describe new terms/concepts

2. a line segment which bisects another line segment at 90 degrees, creating right angles
3. line segments whose lengths are equal
4. statements accepted as true without requiring proof
5. statement in which the hypothesis and conclusion of the original conditional statement are interchanged
6. two objects have the same size and shape
7. a line, line segment, ray, or point that cuts a line segment exactly in half
9. statement believed to be true but not yet proven
12. a statement that can be proved to be true based on known and proved facts
14. a flat surface that extends into infinity
15. construction of accurate representations of lengths, angles, and geometric figures using only a straight edge and compass
17. a line with a single endpoint that extends infinitely in one direction
22. models an exact location in space, and has no length, width, or thickness
24. a statement composed of a hypothesis (if) and a conclusion (then)