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22 Cards in this Set
 Front
 Back
perpendicular bisector

…of a side of a triangle is a line, segment, or ray that passes through the midpoint of the side and is perpendicular to that side.
Property: Any point on a perpendicular bisector is equidistant from two vertices 
concurrent lines

three or more lines intersecting at a common point

point of concurrency

the point of intersection of concurrent lines

circumcenter

the point of concurrency of the perpendicular bisectors of a triangle

Circumcenter Theorem

The circumcenter of a triangle is equidistant from the vertices of the triangles.

angle bisectors

Property:
Any point on the angle bisector is equidistant from the sides of the triangle. 
incenter

the point of concurrency of the angle bisectors of a triangle

Incenter Theorem

The incenter of a triangle is equidistant from each side of the triangle.

median

segment whose endpoints are a vertex of a triangle and the midpoint of the side opposite it

centroid

the point of concurrency of the medians of a triangle

Centroid Theorem

The centroid of a triangle is located two thirds of the distance from a vertex to the midpoint of the side opposite the vertex on a median.

altitude

...of a triangle is a segment from a vertex through the line containing the opposite side and is perpendicular to that side

orthocenter

the point of concurrency of the altitudes of the triangle

Exterior Angle Inequality Theorem

If an angle is an exterior angle of a triangle, then its measure is greater than the measure of either of its remote interior angles.

If one side of a triangle is longer than another side, then…

...the angle opposite the longer side has a greater measure than the angle opposite the shorter side

If one angle of a triangle has a greater measure than another angle, then…

...the side opposite the greater angle is longer than the side opposite the smaller angle.

Triangle Inequality Theorem

The sum of the lengths of any two sides of a triangle is greater than the length of the third side.

shortest distance from a point
to a line is… 

shortest distance from a point
to a plane is… 

SAS Inequality Theorem
(Hinge Theorem) 

SSS Inequality Theorem



