Clint is building a wooden swing set for his children. Each supporting end of the swing set is to be an A-frame constructed with two 10-foot-long 4 by 4s joined at a 45 angle. To prevent the swing from tipping over, Clint wants to secure the base of each A-frame to concrete footings. How far apart should the footings for each A-frame be? The footings should be about | |feet apart. (Round to two decimal places as needed.)