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 9-foot-long 4 by 4s joined at a 30° angle. To prevent the swing set 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? ....

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A: diagram:

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