A triangular flower bed is being designed using portions of two sidewalks as boundaries as shown by segments overline BC and overline AC. The length of the sidewalk from B to C is 13 meters and the length of the sidewalk from A to C is 12 meters. If the design is to include a right angle at angle A, what is the measure for the third boundary overline AB , to the nearest tenth of a meter? A) 17.7 meters B) 5.0 meters C) 25 meters D) 5.1 meters E) 4.9 meters