The length of the missing side is 3ft.
What is Area ?
Area is defined as the space occupied by a flat surface .
It is measured in square units.
It is given in the question
A rectangle with one side as 4ft.
Area of the rectangle = 12 sq.ft
Other side = ?
Area of a rectangle is given by Length * Breadth
Area = one side * other side
Substituting the values
12 = 4 * other side
other side = 3 ft.
Therefore the length of the missing side is 3ft.
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