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12'5 = 12.4166... feet
The total surface area, of all four walls, floor and ceiling is
2*(12.4166...*12.4166... + 12.4166...*10 + 10*12.4166...)
=2*(154.1736 + 124.1667 + 124.1667) = 2*402.5069 = 805.01 sq feet (to 2 dp)
For the surface area of a rectangular prism (like a non-square room) multiply each number by each other number, add them together and multiply by 2.
A) 12' 5"=149"
B) 12' 5"=149"
C) 10' =120"
A*B
A*C
B*C
149*149=22201
149*120=17880
149*120=17880
57961 sq in
x 2
115922
115922 sq in= (divide by 144 because 1 square foot is 12*12 which is 144 sq in per foot) 805 sq ft 2 sq in
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