# GeometryChapter4

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 Author: Minhs2 ID: 182158 Filename: GeometryChapter4 Updated: 2012-11-07 00:12:51 Tags: Geometry Chapter4 vocabulary Folders: Description: Geometry Chapter 4 vocabulary Show Answers:

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1. acute triangle
A triangle with three acute angles.
2. auxiliary line
A line drawn in a figure to aid in a proof.
3. base angle
One of the two angles that have the base of the triangle as a side.
4. base
The side opposite the vertex angle.
5. congruent polygons
Two polygons whose corresponding sides and angles are congruent.
6. coordinate proof
A style of proof that uses coordinate geometry and algebra.
7. corollary
A theorem whose proof follows directly from another theorem.
8. corresponding angles of polygons
Angles in the same position in two different polygons that have the same number of angles.
9. corresponding sides of polygons
Sides in the same position in two different polygons that have the same number of sides.
10. CPCTC
An abbreviation for "Corresponding Parts of Congruent Triangles are Congruent," which can be used as a justification in a proof after two triangles are proven congruent.
11. equiangular triangle
A triangle with three congruent angles.
12. equilateral triangle
A triangle with three congruent sides.
13. exterior
the set of all points outside a polygon
14. exterior angle
The angle formed by one side of a polygon and the extension of an adjacent side.
15. interior
the set of all points inside the figure
16. interior angle
The angle formed by two sides of a polygon with a common vertex
17. included angle
The angle formed by two adjacent sides of a polygon.
18. included side
The common side of two consecutive angles of a polygon.
19. isosceles triangle
A triangle with at least two congruent sides.
20. leg of an isosceles triangle
One of the two congruent sides of the isosceles triangle.
21. obtuse triangle
A triangle with one obtuse angle.
22. remote interior angle
An interior angle of a polygon that is not adjacent to the exterior angle.
23. right triangle
A triangle with one right angle.
24. scalene triangle
A triangle with no congruent sides.
25. triangle rigidity
A property of triangles that states that if the side lengths of a triangle are fixed, the triangle can have only one shape.
26. vertex angle
The intersection of 2 sides of the triangle

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