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.
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At a yard sale.
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.
Each of the short sides is 7 feet long and each of the long sides is 7x2 (14) + 3 which equals 17 feet long. So the width is 7 feet.
To find the area of a rectangle, you multiply the length by the width. In this case, 10 feet x 3 feet equals 30 square feet. This is because you are essentially finding the area of a rectangle that is 10 feet long and 3 feet wide, resulting in a total area of 30 square feet.