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18 Cards in this Set

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  • Back
midsegment
the segment connecting the midpoint of 2 sides of a triangle
Triangle Midsegment Theorem
if a segment joins the midpoints of 2 sides of a trianlge, then the segment is parallel to the 3rd side and half its length
perpendicular bisector theorem
if a point lies on the perpendicular bisector of a segment, the it is equidistant from the endpoints of the segment
c. of perpendicular bis. theorem
if a point is equidistant from the endpoints of the segment, then its on the perpendicular bisector of a segment
distance from a point to a line
the length of the perpendicular segment from the point to the line
angle bisector theorem
if a point is on the bisector of an angle, then it is equidistant from the sides of the angle
c. of anvlge bis. theorem
if a point is equidistant from the sides of an angle, then it is on the angle bisector
concurrent
when 3 or more lines intersect in 1 point
point of concurrency
a point of intersection of a set of 3 ore more lines or segments
circumcenter
the point of concurrency of the perpendicular bisectors
theorem 5-6
the perpendicular bisectors of the sides of a triangle are concurrent at a point equidistant from the vertices
incenter
the point of concurrency of the angle bisectors of a triangle
theorem 5-7
the angle bisectors of a trianlge are concurrent at a point equidistant from the sides
median
a segment whose endpoints are at a vertex and the midpoint of the opposite side
centroid
the point of concurrency of 3 medians
theorem 5-8
the medians of a triangle are concurrent at a point that is 2/3 the distance from each vertex to the midpoint of the opposite side
altitude
the perpendicular segment from a vertex of an angle to the line containing the opposite side
theorem 5-9
the lines that contain the altitude of a triangle are congruent