Surface area is the sum of area of all the faces .
In the net diagram, we have 6 faces. So we have to find the area of each face and add them to find the surface area .
And since each face is rectangle in shape, so we will use the formula of area of rectangle, which is
[tex]Area= length*width[/tex]
So the required surface area is
[tex]A = (11*5)+(11*4)+(11*5) +(11*4)+(5*4)+(5*4)
\\
A = 55+44+55+44+20+20 =238 mm^2[/tex]
And that's the required surface area of the rectangular prism .
