The attached figure represents the complete flowchart.
How to complete the flowchart?
The given statement is:
∠1 ≅ ∠2
To prove
∠3 ≅ ∠4
By vertical angle theorem, we have:
∠2 ≅ ∠4
By transitive property of congruence, we have:
∠2 ≅ ∠3
By transitive property of congruence, we have:
∠1 ≅ ∠3
By vertical angle theorem, we have:
∠3 ≅ ∠4
See attachment for the complete flowchart.
Read more about vertical angles at:
https://brainly.com/question/24460838
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