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Chapter 5: Properties of Triangles
HS Geometry vocabulary related to triangle properties
13
Mathematics
9th Grade
11/11/2011

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Term
Perpendicular Bisector
Definition
A segment (or line, ray, or plane) that is perpendicular to a segment at its midpoint.
Term
Equidistant
Definition
Having the same distance from two points or lines.
Term
Concurrent Lines
Definition
When three or more lines (or rays or segments) intersect at the same point.
Term
Point of Concurrency
Definition
The point of intersection of three or more concurrent lines.
Term
Circumcenter of a triangle
Definition
The point of concurrency of the three perpendicular bisectors of a triangle.
Term
Angle Bisector of a Triangle
Definition
A bisector of an angle of the triangle.
Term
Incenter of the Triangle
Definition
The point of concurency of the three angle bisectors of a triangle.
Term
Median of a Triangle
Definition
A segment in a triangle whose endpoints are a vertex of the triangle and the midpoint of the opposite side.
Term
Centroid of a Triangle
Definition
The point of concurrency of the three medians of the triangle.
Term
Altitude of a Triangle
Definition
The perpendicular segment from a vertex to the opposite side or the line that contains the opposite side.
Term
Orthocenter of a Triangle
Definition
The point of concurrency of the three altitudes of a triangle.
Term
Midsegment of a Triangle
Definition
A segment that connects the midpoints of two sides of a triangle.
Term
Indirect Proof
Definition
A proof in which you prove that a statement is true by first assuming that its opposite is true.
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