Question

Walk me through this

Answer 1

the construction is mostly correct.
Here is how to do it.
http://www.mathopenref.com/constperplinepoint.html
(your version uses a compass to find a point below the line, which works, but we don't have to do that.. )

the problem is the last line. It's really a test in reading comprehension

Answer 2

Reading the construction given, and watching the construction you linked me too, they both seem really different. You said the problem was Step 5, would that be because you don't connect the two? @phi