Am I too late to answer this
It's going to be 82 (A)i think .
29 miles
because town y is between town x and town z so you can take the distance between town x and town z and subtract the distance from town y to town z
The circumference of a circle of diameter 13 m is 13π m, about 40.82 m.
(40.82 m)/(2.5 m) = 16.328
16 may be the best approximation of the number of pieces Malia will need. 17 pieces will make a barrier that is longer (larger diameter) than is needed.