# Geometry Vocab Ch 4

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1. Acute Triangle
3 acute angles
2. Equiangular Triangle
Three congruent acute angles
3. Right Triangle
One right angle
4. Equilateral Triangle
Three congruent sides
5. Scalene Triangle
No congruent sides
6. Interior Angle
formed by two sides of a triangle
7. Exterior angle
formed by one side of the triangle and the extension of an adjacent side. Each exterior angle has two remote interior angles
8. Remote interior angle
interior angle that is not adjacent to the exterior angle
9. Corresponding angles + Corresponding sides
the same position in polygons with an equal number of sides
10. Congruent polygons
(example) Two polygons are congruent polygons if and only if their corresponding angles and sides are congruent. Thus triangles that are the same size and shape are congruent
11. Triangle rigidity
provides a shortcut for proving two triangles congruent. (example) It states that if the side lengths of a triangle are given, the triangle can only have one shape
12. Included angle
Angle formed by two adjacent sides of a polygon
13. Included side
Common side of two consecutive angles in a polygon
14. Angle-Side-Angle (ASA)
If two angles and the included side of one triangle are congruent to two angles and the included side of another triangle, then the triangles are congruent
15. Hypotenuse-Leg (HL)
If the hypotenuse and a leg of a right triangle are congruent to the hypotenuse and a leg of another right triangle, then the triangles are congruent
16. CPCTC - abbreviation for the phrase “Corresponding Parts of Congruent Triangles are Congruent.”
Can be used as a justification in a proof after you have proven two triangles congruent
17. Coordinate proof
A style of proof that uses coordinate geometry and algebra. The first step of a coordinate proof is to position the given figure in the plane
18. Legs
shorter sides of a angle or triangle
19. Vertex angle
angle formed by the legs
20. Base
opposite side of the vertex angle
21. Base angles
two angles that have the base as a side

## Card Set Information

 Author: Danielvu28 ID: 113515 Filename: Geometry Vocab Ch 4 Updated: 2011-11-01 00:56:30 Tags: Geometry Vocab Folders: Description: Guthrie Show Answers:

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