At a yard sale.
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You can find a ruler that is 3 feet long in the hardware store or office supply store. Look for a measuring tool specifically labeled as a yardstick, which is typically 36 inches long, equivalent to 3 feet. Alternatively, you can also find rulers of various lengths, including 3 feet, online through specialty retailers or educational suppliers.
A metre stick is a ruler that is 1 metre long. (A little bit more than 3 feet.)
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.
12 * * * * * More likely, 3 feet.
There are 3 feet in 1 yard, so 3 feet x 3 yards = 9 feet. 21 feet is more than twice as long as 9 feet.