Download Math B Vocabulary for Triangle Proofs

Geometry Vocabulary for Triangle Proofs
Across
Down
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.
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.
Solution for the Teacher