We have an triangle: base=4 in height=3 in, This triangle can be dividided into two equal triangles, we need calculate the hypotenuse. leg₁=4 in/2=2 in leg₂=3 in
Now, we can find the surface area. Surface area=2 *(rectangle area)+base area + 2(triangle area) rectangle area=10 in x √13 in=10√13 in² base area=10 in x 4 in=40 in² Triangle area=(4 in x 3 in)/2=6 in²