The following is an incorrect flowchart proving that point L, lying on LM which is a perpendicular bisector of
JK, is equidistant from points J and K:
LM is a perpendicular bisector
of JK
Given
4LNK = 90°
4LNJ = 90"
Definition of a
Perpendicular Bisector
JNNK
Definition of a
Perpendicular Bisector
4LNK as 4LNJ
Definition of Congruence
Point L is equidistant from
points J and N
Definition of Equidistant
What is the error in this flowchart?
LN LN
Reflexive Property of
Equality
JL = KL
Definition of Congruence
Draw JL and KL
by Construction
AJNL & AKNL
Side-Angle-Side
(SAS) Postulate
XaKL
Corresponding Parts of
Congruent Triangles are
Congruent (CPCTC)
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