Can anyone teach me how to calculate this surface area ?

Answer:Step-by-step explanation:oof. okay.so basically you have to find the area of each face of this shapeso I will write each area for you just so that I can keep track of where I am.So the top one is 2*3=6and then the side of that is 3*1=3and then the next stair is 3*1 =3and then again another 3*1=3and the top of the bottom stair is 3*1=3the side of that last one is 2*3=6the back of the stair thingy is 4*3=12now the weird side is (4*2)+(3*1)+(2*1)=13you need two of those sides so another (4*2)+(3*1)+(2*1)=13(for these ones I divided it up into three parts; one were each star begins making it appear that there is a small rectangle on top of a medium rectangle on top of a large rectangle)and the bottom is 4*3=12so then you add them all up6+3+3+3+3+6+12+13+13+12that all equals 74I hope this helps!