Steve puts a border around his tree that is ten inches wide. The radius of the tree is fourteen inches. What is the circumference of the border? Solution Given the radius of tree = 14 inches then the radius of the border around his tree that is ten inches wide = 14 + 10 = 24 inches then circumference of the border = 2pi(r) = 2(22/7)*24 = 150.857 Inches.