Chapter 4

2. Triangle- a triangle which all of the angles are acute angles
6. transformation over a line called the line of reflection
7. Angles- two angles formed by the base and the congruent sides
8. Angle- 1 right angle
9. Angle- the angle formed by two adjacent sides of a polygon
11. is a theorem with a proof that follows as a direct result of another theorem
13. Triangle- 3 congruent acute angles
15. Line- is an extra line or segment drawn in a figure to help analyze geometric relationships
16. Sides- is the side located between two consecutive angles of a polygon
17. Polygons- all of the parts of one polygon are congruent to the corresponding parts or matching parts of the other polygon
18. Angle- the angle with sides that are the legs
19. Proof- uses statements written in boxes and arrows to show the logical progression of an argument

1. Interior Angles- the angles of a triangle that are not adjacent to given exterior angle
3. Triangle- 1 obtuse angle
4. is a transformation that moves all points of the original figure the same distance in the same direction
5. Transformation- is one in which the position of the image may differ from that of the preimage, but the two figures remain congruent
10. Triangle- no congruent sides
12. transformation around a fixed point called the center of rotation, through a specific angle, and in a specific direction
13. Triangle- 3 congruent sides
14. Triangle- at least 2 congruent sides