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28 feet long and wide
21
676 feet
The area is 15*20 = 300 square feet.
120 feet
28 feet long and wide
If the lawn is twice as long as it is wide, and length times width is 288, then 3x = 288, or x = 96. The lawn is then 96 by 192 feet. This means that the perimeter is 576 feet (96 + 96 + 192 + 192).
17 feet.
16 feet long and 3 feet wide is 4.46 square meters.
21
15 square feet
450 square feet.
676 feet
Area is calculated by multiplying width x length. Thus the square feet in an area 20 feet wide by 24 feet long is 20 x 24 = 480 square feet.
25.4125 feet
The area is 15*20 = 300 square feet.
120 feet