How do i find the surface area of a rectangular prism

There is length,  width and height

Length=L

Width=W

Height=H

We can make this equation to solve the surface area of a rectangular prism.

(L*W*2)+(L*H*2)+(H*W*2)=SA (Surface Area)

For this specific problem,  the equation is:

(15*12*2)+(15*6*2)+(12*6*2)

We can use the calculator to find this out

$$\left({\mathtt{15}}{\mathtt{\,\times\,}}{\mathtt{12}}{\mathtt{\,\times\,}}{\mathtt{2}}\right){\mathtt{\,\small\textbf+\,}}\left({\mathtt{15}}{\mathtt{\,\times\,}}{\mathtt{6}}{\mathtt{\,\times\,}}{\mathtt{2}}\right){\mathtt{\,\small\textbf+\,}}\left({\mathtt{12}}{\mathtt{\,\times\,}}{\mathtt{6}}{\mathtt{\,\times\,}}{\mathtt{2}}\right) = {\mathtt{684}}$$

The surface are for this problem is 684 ft^2

Very nice, h7....

Yes, very nice happy :)

Well square units anyway - I didn't see any mention of feet. :)

The "feet" were on the duck....!!!!!

So  they were Chris, sorry Happy I did not notice.