The reason which allows him to write the statement could be reflexive property.
What is the reflexive property of congruence?
The reflexive property of congruence says that the considered geometric quantity, whether it be the angle, line segment, shape etc, is congruent to itself.
Michael writes, "Segment AC is congruent to segment AC."
The triangles in the figure are congruent by SSS Property.
This states that triangles are congruent if all the sides in one triangle are congruent to the corresponding sides of another.
The reason which allows him to write the statement could be reflexive property.
The three sides of triangle ABC is congruent to triangle CDA.
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