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Transcript
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