Two parallel lines, A and B, are cut by transversal C as shown. Complete the proof that ∠1 ≅ ∠7 In the following image you will find a drag-and-drop of phrases used to complete the chart. 
Image is displayed in the next link, (web2.0calc isn't letting me upload an image for some reason after many attempts).
https://imgur.com/a/kNLhwdf
