Question

What’s is the missing justification in the proof ?

Answer 1

Answer:

By definition of supplementary angles

Step-by-step explanation:

We have to prove that

$\angle 1=\angle 3$

We have to find missing justification in the given proof.

Proof:

Segment CD intersect segment AB

Reason: Given

$\angle 1+\angle 2=180^{\circ}$

$\angle 2+\angle 3=180^{\circ}$

Reason: By definition of supplementary angles

$\angle 1+\angle 2=\angle 2+\angle 3$

Reason: Transitive property

$\angle 1=\angle 3$

Reason: subtraction property of equality

Answer 2

Definition of supplementary angles. Hope this helps. Can you mark me as brainliest if you can? I really appreciate it!