you don't. that's like asking how many dollars are in 10 feet. the units "linear feet" and "square feet" represent two totally different types of quantities. if you have a rectangle made up of 216 linear feet, the area (in square feet) could be practically anything. If the sides are 50 and 58, the perimeter is 216 linear feet and the area is 2,900 square feet. But if the sides are 10 and 98 feet, the perimeter is still 216 linear feet, while the area is now 980 square feet.
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Area is length x width. 12 x 18 = 216, so the shop has 216 square feet
The square root of 216 is ~14.7
You would find the area by multiplying the width by the length, so the area would be 216 square feet.
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The formula for finding the area of a rectangle is width multiplied by length. In this case, 12 feet by 18 feet is equal to 216 square feet.