Question

Find the surface area of this shape (here is the grid too)

Answer 1

12

Explanation:

The second diagram is most helpful for finding the surface area.

1. Find the area of the middle square: 2 * 2 = 4
2. Find the area of the triangle using A = 1/2*B*H, so A = 1/2 * 2 * 2 = 2
3. Since there are 4 triangles, the surface area of all the triangles is 2 * 4 = 8
4. Add the surface area of the triangles with the surface area of the square to get the total surface area: 8 + 4 = 12

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