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Chapter 5
Relationships in Triangles
11
Mathematics
10th Grade
01/02/2013

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Cards

Term
Perpendicular Bisector
Definition

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When a bisector is also perpendicular to the segment being bisected.

Term
Concurrent lines
Definition

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Three or more lines that intersect at a common point.

Term
Point of Concurrency
Definition

The point where concurrent lines intersect.[image]

 

Term
Altitude
Definition
In a triangle, a segment from a vertex to the line containing the opposite side and perpendicular to the line containing that side.[image]
Term
Centroid
Definition

The points of concurrency of the medians of a triangle.

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Term
Circumcenter
Definition

The point of concurrency of the perpendicular bisectors of a triangle. It is also equidistant from the vertices of the triangle.

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Term
Incenter
Definition

The point of concurrency for the angle bisectors of a triangle. 

 

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Term
Indirect Proof or Proof by Contradiction
Definition
A proof where you temporarily assume that what you are trying to prove is false.
Term
Indirect Reasoning
Definition
A method of reasoning that assumes a conclusion to be false and then showing that the assumption leads to a contradiction. 
Term
Median
Definition

A segment with endpoints being a vertex of a triangle and the midpoint of the opposite side. 

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Term
Orthocenter
Definition

The intersection of concurrent lines containing the altitudes of a triangle. 

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