Respuesta :

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

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