Sam's 15 ft x 28 ft rectangular fenced backyard is shown in the diagram below. 28 ft 15 ft Sam tied his dog on a 10-foot rope attached to a one of the corner post on the fence. Which expression can be used to find how many square feet the dog has to roam? ④ 를(T)(20) T(102) 4 C 16(10) 2 O (28 ·15) – ( · 102) B

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