By the linear pair theorem, JLM is supplementary to /KLM. Since JLM/KLM, by the definition of congruence, m/JLM =m/KLM
Applying the substitution property of equality, m/JLM + m/JLM 180°. Simplifying the equation, m/JLM-90°.
"What step is missing from this proof?
A.
JLM KLM by the linear pair theorem.
O B. m/JLM+m/KLM = 180° by the definition of supplementary angles.
OC. JLM is supplementary to KLM by the transitive property.
D.m/JLM
m/KLM by the definition of congruence.