A Yard Stick
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A yard, of course!
Each yardstick measures 3 feet. Two yardsticks is 6 feet. One 12-inch ruler is one foot. Laid end to end, this makes 7 feet.
A cylinder has a circular face at each end, and a rectangular face folder around the middle. The only edges are the edges of the circular ends.
So each tile is 12" by 12" square, right? So each tile is ONE square foot? (a perfect square that's a foot long and a foot wide). Each tile is one square foot and you need to know how many add up to 400 square feet. I think the answer is the square root of Pi.
There are 12 inches in a foot and four quarters on each inch so there are 12*4=48 qurters of an inch in one foot.