The bottom of the foot is called the plantar surface. Plantar flexing is contracting the muscles of the foot so that the toes move down and the arch increases.
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Ummm . . . there is 1 square foot in a square foot. The square foot could be any dimensions, like 1 foot by 1 foot, or half a foot by 2 feet, or a quarter of a foot by 4 feet . . . . .
One square foot is 1 foot X1 foot, 1 foot square is also 1 foot x 1 foot. The only difference is that in 100 square feet it would be 10 x 10 or 5 x 20 etc but in a 100 foot square it is 100 feet X 1 foot only.
between the toes
4 ft by 4 ft = 4*4 = 16 square feet.
27.3 feet