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Across
3. A method of proving triangles congruent that deals with an included angle.
5. A style of proof using contradiction.
7. The name given to two nonadjacent angles formed by two intersecting lines.
9. Used when a side is shared by two congruent triangles.
11. A line (or subset of a line) that intersects the segment at its midpoint.
13. A method of proving triangles congruent that deals with two angles and the included side.
14. The last step in a proof shows that this statement is true.
17. The line segment extending from any vertex of a triangle perpendicular to the line containing the opposite side.
19. A method of proving triangles congruent that deals with a non-included side.
20. Two lines intersecting to form right angles.
22. A 180 degree angle.
24. Of equal measure.
25. A 90 degree angle.
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Down
1. An angle between 0 and 90 degrees.
2. The name given to matching parts of congruent triangles.
4. A triangle with no congruent sides.
6. The information you assume true when starting a proof.
8. Two angles the sum of whose measures is 90.
10. A method of proving triangles congruent that deals with three sets of sides.
12. A triangle with two congruent sides.
13. The name given to angles that share a vertex, a common side and no common interior points.
15. An angle between 90 and 180 degrees.
16. The point on a line segment that divides the segment two congruent segments.
18. A line segment extending from any vertex of a triangle to the midpoint of the opposite side.
21. Before beginning a proof, ____ the diagram.
23. A method of proving right triangles congruent.
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