Triangle Congruence Proofs – Vocab Reference Sheet
Vocab Word
Midpoint
Segment Bisector
Angle Bisector
Definition
Picture
M is the midpoint
The point that
JL
divides a segment of
into two
congruent
segments
A point, ray, line,
line segment, or
plane that
intersects a
segment at its
midpoint
A ray that divides
an angle into two
angles that are
congruent
KM bisects JL
MK bisects JKL
(definition of a
midpoint)
JM  LM
JKM  LKM
(definition of an
angle bisector)
Two lines that
intersect to form a
right angle
JMK , LMK are
right
(definition of
perpendicular lines)
JMK , LMK are
right
Right Angle
JM  LM
(definition of a
segment bisector)
KM ⊥ JL
Perpendicular
Lines
Statement
An angle that has
a measure of 90°
JMK  LMK
(Right Angles
Congruence Thm)
OR
JMK , LMK are right
(Definition of Right
Triangle)
Perpendicular
Bisector
A line that is
perpendicular to
a segment at its
midpoint
KM is the
perpendicular
bisector of JL
JMK , LMK are right
(Definition of
Perpendicular Bisector)
AND
JM  LM
(Definition of
Perpendicular Bisector)