Answer:
Circumference = 2πr = πd
Diameter of patio = 26
Circumference of patio = 26π
The flower garden is inside the patio, 6 feet from each edge. The diameter of the flower garden = 26 - 6 - 6 = 14
Circumference of flower garden = 14π
26π + 14π = 40π = 125.6637061 feet = 126 feet to 3sf.