Jungle John participates in a reality TV show that features fitness and agility competitions.
 In order to beat the competitors, John will need to swing from tree A to tree B, completing an arc of at least 60 feet with a central angle of 115∘.
 What length of rope (radius) will he need to accomplish this activity?
 Round your answer to the nearest foot.
 30 ft.
 25 ft.
 36 ft.
 15 ft.