The pied piper and his friends will have walked 675 feet after 3 complete trips around a regular pentagon track with each side measuring 45 feet.
The pied piper and his friends are walking around a track that is shaped like a regular pentagon. Each side of the pentagon measures 45 feet. To find the total distance walked by the pied piper and his friends after making 3 complete trips around the track, we need to first calculate the perimeter of the pentagon by multiplying the length of one side by the number of sides in a pentagon, which is 5.
The perimeter is therefore 45 feet times 5, which equals to 225 feet for one trip around the track. Multiplying this by 3 gives us the total distance walked after three trips, which is 225 feet times 3.
The total distance walked after 3 complete trips around the track by the pied piper and his friends is 675 feet. Therefore, the correct option is: c) 675 feet.