We can conclude angle 1 is congruent to angle 3 using the Transitive Property of equality (if a ≈ b and b ≈ c, then a ≈ c), and the Definition of Congruent Angles, which states that congruent angles have the same measure. So, the correct answer is C and D.
Given that angle 1 is congruent to angle 2 and angle 2 is congruent to angle 3, we are able to conclude that angle 1 is congruent to angle 3 because of the Transitive Property.
The Transitive Property states that if a ≈ b and b ≈ c, then a ≈ c. This applies to angles, making angle 1 congruent to angle 3. In mathematics, the Definition of Congruent Angles is also relevant because it explains that congruent angles have the same measure.
Therefore, the two reasons that allow us to reach this conclusion are the Transitive Property and the Definition of Congruent Angles.