The area would be 30 square feet.
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625 sq feet.
The maximum area possible using 100 feet of fencing is that inside a circular fence. But, since you asked about a rectangular fence: a 25x25 fence would hold 625 square feet. a 10x40 fence would hold 400 square feet. a 5x45 fence would hold 225 square feet. As you can see, the square is the rectangle that encompasses the largest area, as it is closest to a circle.
To compute the linear meter of a fence, measure the total length of the area you want to enclose. This involves adding together the lengths of all the sides of the fence. If the area is rectangular, use the formula: linear meters = 2 × (length + width). For irregular shapes, sum the lengths of each side individually to get the total linear meters required.
For the same base dimensions (base area) and the same height, the rectangular prism has more surface area.
Given the surface area of a rectangular prism, there are infinitely many rectangular prisms possible.