The perimeter of a square of side length 'a' cm is '4a' cm.
The perimeter of a square whose side length is 3.25 cm is ______ cm.
The perimeter of a square is 40 cm. The length of its side is ___ cm.
What is the perimeter of a square of side length 15 cm?
The perimeter of a square is 60 cm. Find its side-length.