Hey there! To find surface area, we need to cut this figure into 3 separate shapes (I included a link to help explain a little better). Once this is done, calculate the area of each one, using the formula length * height. Now, add up the area from each individual shape, and you've got the answer!
Figure A: 1 * 3 = 3
Figure B: 1 * 3 = 3
Figure C: 1 * 4 = 4
3 + 3 + 4 = 10.
Therefore, the surface area of this figure is 10.
