Answer:
63 ft^2
Step-by-step explanation:
First find the area of the deck: (9*9) = 81 ft
Then the area of a triangle: Following the formula (l*h)/2, we get 4.5 ft
There are four of the triangles so it is 4.5*4 = 18 ft
The area of the deck not covered by benches is 81-18, or 63
