Janet is designing a frame for a client. She wants to prove to her client that M angle one equals M angle three and her sketch. What is the missing justification in the proof?

Option (1)

Step-by-step explanation:

                     Statement                               Justification

1). Segment CD intersects              1).Given

   segment AB

2). ∠1 + ∠2 = 180°                             2). Definition of supplementary angles        

    ∠2 + ∠3 = 180°

3). ∠1 + ∠2 = ∠2 + ∠3                      3). Transitive property

4). ∠1 = ∠3                                       4). Subtraction property

Therefore, Option (1) is the correct option.

c.)

step-by-step explanation: