10'12" x 23"=
10'12" = 11'
11' (12 in/ft) x 23" = 3036 in^2
3036/144 = 21.0833 ft^2
10 x 12 +12=132 inches
132 x 23 =3,036 square inches.
1 Square foot=12 x 12 =144 sq.inches
3,036 / 144 =21 1/12 square feet
+37146 +37146 
