40 x 90 = 3600 square feet. No exponents are necessary.
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First of all divide 2" by 12" to get 0.1666 feet; then multiply 0.1666' x 40' x 40' which equals 266.56 cubic feet; Multiply 266.56 cubic feet x 0.03704 to get 9.8734; Therefore, 2 inches of topsoil from an area 40 feet by 40 feet = 9.87 cubic yards. Hope that helps. The number 0.03704 is purely a conversion rate for cubic feet to cubic yards.
The area of square is : 196.0
to find area and perimeter of a rectangle
Calculating gross living area can be a simple process. To calculate gross living area multiply the dimensions of the area together.
area= side^2 let the symbol # denote error in measurement #area/area= 2(#length/length) #area/area*100= 2(#length/length)*100 percent error in area= 2*percent error in length=2% 2 per cent