Answer:
290 mm
Step-by-step explanation:
Since you have the three side lengths needed, all you need to do is use the formula 2[(lh)+(wh)+(lw)].
So it would look something like this --> 2[(3*11)+(3*8)+(11*8)]
This gives you 2[(33)+(24)+(88)]
Now you have 2(145)
And your final answer is --> SA = 290
