(03.01 LC)
Carlos draws a transversal, t, on two parallel lines AB and CD, as shown below:
He makes the following table to prove that the alternate interior angles are equal:
Justification
Corresponding angles of parallel lines are congruent.
Statement
angle 1-angle 5
angle 1-angle 3
angle 3-angle 5
?
transitive property of equality,
angle 1 - angle 5,
angle 1-angle 3,
therefore angle 3-angle 5
Which is the missing justification? (6 points)