Perimeter = 2(length + width)
→ width = perimeter ÷ 2 - length
length = 1 foot → width = 70 ft ÷ 2 - 1 ft = 34 ft;
length = 2 feet → width = 70 ft ÷ 2 - 2 ft = 33 ft.
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You are describing a cuboid, not a rectangle. A rectangle has only two diminutions, length and width.
If the dimensions of the rectangle are in feet, the perimeter will be in feet as well. The area will be in square feet. The area is length x width. The perimeter is 2 x (length + width) or 2 x length + 2 x width.
5 feet
20
15 feet