Question

you have been asked to help build a rectangular play area at the new tracy elementary school. you arrive at the site eager to begin. much to your suprise, the only things available to work with are two pieces of rope.
Explain how you can use the rope to find the vertices of the rectangle. Include an illustration and a detailed explanation of your solution.

Answer 1

This might give you some ideas:
http://www.mathopenref.com/constangle90.html

Answer 2

Here is another
http://www.mathopenref.com/constperplinepoint.html