Area is simple Area=Length*Width. So in this case A=18*13. You can multiply those numbers to get A=234. So your area is 234.
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To find the total square footage of an 18ft by 18ft area, you would multiply the length (18ft) by the width (18ft) because the area of a rectangle is calculated by multiplying its length by its width. So, yes, you would multiply 18 by 18 to get the answer. This would give you a total of 324 square feet for an area that is 18ft by 18ft.
18-ft x 11-ft = 198 square ft
18ft x 17 ft = 306 sq metres = 28.4 sq metres, approx.18ft x 17 ft = 306 sq metres = 28.4 sq metres, approx.18ft x 17 ft = 306 sq metres = 28.4 sq metres, approx.18ft x 17 ft = 306 sq metres = 28.4 sq metres, approx.
6 ft 8 in
13 ft is 3.96 m 70 ft is 21.34 m 3.96 x 21.34 = 84.5 m^2