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geometry
morphew chapter 4
24
Mathematics
10th Grade
11/04/2008

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Term
Acute triangle
Definition
A triangle with three angles measuring less than 90 degrees.
Term
Base
Definition
In an isosceles triangle, it is the side opposite the vertex angle
Term
Congruence transformation
Definition
When a geometric figure and its transformation image are congruent such as a slide , rotation or flip
Term
Congruent triangles
Definition
Triangles that have their corresponding parts congruent
Term
Corollary
Definition
A statement that can be easily proven using a theorem.
Term
Equiangular triangles
Definition
Triangles with all three angles congruent
Term
Equilateral triangles
Definition
Triangles with all three sides congruent
Term
Exterior angle
Definition
An angle that forms a linear pair with one of the angles of a polygon
Term
Included side
Definition
In a triangle, the side between two angles
Term
Polygon
Definition
A closed figure in a plane that is made up of segments that intersect only at their endpoints.
Term
Vertices
Definition
The name of the endpoints of a triangle.
Term
Auxillary lines
Definition
A line of line segment added to a given figure to help in proving a result.
Term
Base angles
Definition
In an isosceles triengle, they are the angles opposite the congruent sides.
Term
Included angle
Definition
In a triangle, the angle formed by two sides
Term
Isosceles triangle
Definition
A triangle with at least two sides congruent
Term
Legs
Definition
The two congruent sides of an isosceles triangle.
Term
Obtuse triangle
Definition
A triangle with one angle greater than 90 degrees
Term
Remote interior angles
Definition
The angles of a triangle that are not adjacent to a given exterior angle
Term
Right triangle
Definition
A triangle with one angle measuring exactly 90 degrees
Term
Scalene triangle
Definition
A triangle with no two sides congruent
Term
Sides
Definition
The name of the segments that form a triangle
Term
Triangle
Definition
A figure formed by the segment determined by three noncollinear points.
Term
Triangle
Definition
A figure formed by the segment determined by three noncollinear points.
Term
Vertex angle
Definition
In an isosceles triangle, the angle formed by the congruent sides
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