Let's first tackle the 4 triangles. We need to figure out what is the measurement of each side of the two long sides and the 1 short side. The height of the triangle is 8 inches while the base is 4. The area of an isosceles triangle (triangle with two sides the same length as each other) is 1/2 x b x h (b being base, the bottom of the triangle, and h as height)
4 x 8 is 32 / 2 is 16.
Since you have 4 triangles, that would be 16 x 4 which is 64.
Now to tackle the middle square. Since all the sides are the same, it'd be 4 x 4 which is 16. 64 + 16 is 80
Your surface area is 80 inches squared
