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.
200 lbs per sq ft
84.16 US gallons
Field size
A cube is a three dimensional object with all sides of equal length. A rectangle is a two dimensional figure with two pairs of sides equal in length. Three dimensional is like a rubrics cube, something you can hold. A two dimensional figure is something you can not hold, a drawing is two dimensional.
A 15 cubic foot tank will hold a maximum of about 112.2 gallons of water.
a circle boat, because circles have a larger area
It's a rain gutter designed to hold your choice of plants and used to decorate a wall, fence, porch railing, or other area.
200 lbs per sq ft
A 777-200 can hold a maximum of 440 while a 777-300 can hold 550 maximum.
d orbitals can hold a maximum of 10 electrons when filled.
Each orbital can hold a maximum of two electrons.
The f subshell can hold a maximum of 14 electrons.
The 2s orbital can hold a maximum of 2 electrons.
The second electron shell of an atom can hold a maximum of 8 electrons.
the first level holds a maximum of 2 and the outershells hold a maximum of 8.
The Maxicam 3005 Dumbbell Rack can hold a maximum number of 20 dumbbells.
The second energy level can hold a maximum of 10 d electrons. Each d subshell can hold a maximum of 5 electrons.