substitution property of equality
definition of perpendicular lines
the theorems and postulates used in the proof
A logically inconsistent statement.
Since you didn't include the statements in your question there is no way for us to know
The answer cannot be "a proof" since that can equally be used to show that a statement must be false.
substitution property of equality
definition of congruent angles
definition of perpendicular lines
alternate exterior angles theorem
vertical angles theorem
triangle sum theorem
Corollary.Theorem.Definition.Postulate.
Well the scientific proof provides that we americans can be awesome. Thank you. xD
Corollary.Theorem.Definition.Postulate.
which of the following types of statement can be used to explain the steps of proof?
That one there!
The following is the answer.