36 sq cm
Step-by-step explanation:
This prism is formed by rectangles, and to find the area of a rectangle you have to multiply its sides. So, to find the surface area, you find the area of each rectangle and after add it all:
3Ã2 = 6 sq cm, and your have two of this rectangles
6Ã2 = 12 sq cm, and you also have two of this
3Ã6 = 18 sq cm, and also have two of this
6 + 12 + 18 = 36 sq cm