Question

1. using the figure below to prove that vertical angles, ∠1 and ∠3, are congruent. he used the linear - pair postulate to determine m∠1 + m∠2 = 180° and m∠2 + m∠3 = 180°. 2. what could be the next valid step in his proof? a. say that m∠1 + m∠2 + m∠3 = 180° because of the definition of supplementary angles. b. say that m∠1 + m∠2 + m∠3 = 180° because of the angle addition postulate. c. say that m∠1 + m∠2 = m∠2 + m∠3 because of the angle addition postulate. d. say that m∠1 + m∠2 = m∠2 + m∠3 because of the transitive property.

Explanation:

Answer:

C. Say that \(m\angle1 + m\angle2=m\angle2 + m\angle3\) because of the Angle - Addition Postulate