Show a^2 - b^2 = (a+b) (a-b) in a diagram

In the diagram, the measure of angle 9 is 85° which angle must also measure 85°?

Alonso walked with his friend andy one day, and wanted to compare their speeds. alonso walked 3 miles in one hour, and andy walked 2 miles in 2 hours. complete the table to graph the relationship for each person.

Someone answer this check out the image!