Answer:
[tex]\Large \boxed{\sf 150 \ m^2}[/tex]
Step-by-step explanation:
Surface area of this shape = area of 2 triangles + area of 3 rectangles
[tex](12 \times 5 \times 0.5 \times 2 )+(13 \times 3+12 \times 3+5 \times 3)= 150[/tex]
Height of the triangular base is 12 m.
