Chapter 4

1. Moves every point of a figure the same distance in the same direction.
3. Triangle that has one angle over 90 degrees.
7. Triangle that has three angles lower than 90 degrees.
8. If two sides of a triangle are congruent, then the angles opposite them are congruent.
10. an operation that moves or changes a geometric figure in some way to produce a new figure.
12. Triangle that has no congruent sides.
13. If two angles of a triangle are congruent, then the sides opposite them are congruent.
14. Uses a line of reflection to create a mirror image of the original figure.
15. When at least two geometric figure have exactly the same size and shape.
16. If two sides and the included angle of one triangle are congruent to two sides and the included angle of a second triangle, then the two triangles are congruent.
17. When all the parts of a congruent shape are the same in another congruent shape.
18. Triangle that has one 90 degree angle.
19. If the hypotenuse and leg of a right triangle are congruent to the hypotenuse and a leg of a second right triangle, then the two triangles are congruent.
20. Turns a figure about a fixed point, called the center of rotation.

2. If three sides of one triangle are congruent to three sides of a second triangle, then the two triangles are congruent.
4. Triangle that has three congruent angles.
5. Triangle that has three congruent sides.
6. If two angles and a non-included side of one triangle are congruent to two angles and the corresponding non-included side of a second triangle, then the two triangles are congruent.
9. Triangle that has at least two congruent sides.
11. If two angles and the included side of one triangle are congruent to two angles and the included side of a second triangle, then the two triangles are congruent.
14. a transformation that preserves length, angle measure, and area; also know as isometry.