Chapter 4 Vocabulary

1. This is the property that says if Triangle ABC = Triangle DEF, then Triangle DEF = Triangle ABC.
6. A triangle with all angles less than 90 degrees.
8. A triangle with all 3 sides congruent.
11. An operation that matches a geometric figure onto a new figure.
13. The original geometric figure being mapped in a transformation.
14. These are angles formed by a side of a triangle and extension of another side outside of the triangle.
15. This is the triangle congruence abbreviated ASA.
17. A transformation that is a "turn" around a fixed point.
18. The parts of two congruent polygons that match with each other.
19. This is the triangle congruence that is abbreviated SSS.
23. This is the side located between two consecutive angles of a polygon.
27. A theorem with a proof that follows as a direct result of another theorem.
30. These are the angles inside a triangle that are not adjacent to an exterior angle.
31. An extra line drawn in a figure to help analyze Geometric relationships.
32. A triangle with all 3 angles congruent.
34. The two congruent sides of an Isosceles Triangle.
35. The angle between the legs of an Isosceles Triangle.
36. This is the property that says Triangle ABC = Triangle ABC
37. The new figure being mapped in a transformation.
38. A transformation that is a "flip" over a line of reflection.

2. A type of proof that uses figures in the coordinate plane to prove geometric concepts.
3. A triangle with 2 congruent sides.
4. This is the type of triangle congruence abbreviated SAS.
5. A triangle with one angle greater than 90 degrees.
7. A transformation that is a "slide" of all the points in the same direction.
9. The angles opposite the legs of an Isosceles Triangle.
10. Acute, Right, and Obtuse are ways to classify a triangle by its ____________.
12. A triangle with no congruent sides.
16. Scalene, Isosceles, and Equilateral are ways to classify a triangle by its __________.
20. The measure of each angle of an Equilateral Triangle.
21. A triangle with one right angle.
22. This is the angle formed by two adjacent sides of a polygon.
24. Two geometric figures that have exactly the same size and shape are said to be this.
25. A type of proof that uses boxes and arrows to show logical progression.
26. This is the property that says if Triangle ABC = Triangle DEF and Triangle DEF = Triangle GHI, then Triangle ABC = Triangle GHI.
28. A transformation in which the position of the image may differ from that of the preimage.
29. This is Theorem 4.3 which says that if two sets of angles of 2 triangle are congruent, then the 3rd angles are also congruent.
33. This is the triangle congruence abbreviated AAS.