The obsolete unit confusingly called a "decimal" (decimel) did not have a defined length and width (breadth), but was a standard unit of area equal to 1/100 of an acre.
This would be 435.6 square feet or 40.46 m2.
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The length times the breadth in feet.
work out the cubic feet of your object (height x depth x breadth). Then to convert cubic feet to square feet, divide by the height in feet
if the perimeter is 44 feet and the room is square then each wall is 11 feet (four walls x 11 =44) The area is the length x breadth, in this case 11 x 11 = 121 square feet
One decimal = 435.6 square feet.
If a square's area is 10 square feet, the length of one of its sides is 3.16227766 feet.