Please help me with this question. im not good at dimensions ans such

Answer:
The correct answe id (C) 21.0
Step-by-step explanation:
Answer:
24 sq ft
Step-by-step explanation:
Ⓗⓘ ⓣⓗⓔⓡⓔ
Well, surface area is the area of each side of the shape.
Area of the square: 9 sq ft
Triangles: 15 sq ft {all together}
Then we add them all together
9+15
24 sq ft
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Please, please give brainliest, it would be greatly appreciated, I only a few more before I advance, thanks!