Answer:
The fence shall be 86.55 ft long
Step-by-step explanation:
Let's say, this garden should consist of two parts - rectangle and semicircular, so the rectangle part fence shall be 24 ft + 15 ft + 24 ft = 63 ft long. Since semicircular is aligned to the rectangle, then the diameter of the semicircular will be a opposite side length - D = 15 ft. Let's find out a semicircular length:
C = pi * D = 3.14 * 15 ft = 47.1 ft
Since this is circular length, we should divide it by 2, so semicircular length is 47.1 / 2 = 23.55 ft
So the fence shall be 63 ft + 23.55 ft = 86.55 ft long