Hurry ! what is the surface area of the figure?

Do a separate area for each side of the figure.
SA = 2(10×3) + 4(5×3) + 2(10×5) + 2(5×5)
= 270cm^2
Note: For the top and bottom, split it up into a rectangle and a square then calculate. And be careful not to forget a side when doing composite figures like this. :)

thank you that was right