Answer:324 cm^2
Explanation:
The surface area is just the added areas of each of these faces. That said the easiest area to find is the square right in the middle, which is 36 cm^2 from 6 * 6. Then, we find the area of one of the triangles, which is 72 cm ^2, since the area of a triangle is 1/2 base * height: which is 1/2 * 6 * 12 = 36, times two since two skinny triangles equals one fat triangle. Then, multiply 72 by four, cine there are four fat triangles to get 288 cm^2 and add that to 36 cm^2, which is the area of the square we found in the beginning. It gives you 324 cm^2