Answer:
Step-by-step explanation:
I assume  you have a prism with a length of 16 inches, a width of 9 inches and a height of 4 inches and you want to know the surface area
1st...convert these to feet
16 in  =  1 + 1/3 ft  = 4/3 ft
9 in  =   3/4 ft
4 in  = 1/3 ft
And the surface area  =
2 [ 4/3 * 3/4 Â + 4/3 * 1/3 + Â 3/4* 1/3 ] =
2 [ 1 Â + 4/9 + 1/4 ] =
2 [ ( 36 + 16 + 9 ) / 36 ] =
(1/18) ( 61) =
(61 / 18)  sq ft  ≈  3.38 sq ft.
