684 ft²
Area of rectangle :-
A = 18 ft * 20ft
A = 360 ft²
Area of 2 triangles :-
A = 2 * 8ft * 18 ft * 1/2
A = 144 ft²
A = 2 * 1/2 * 9ft * 20ft
A = 180 ft²
Total Area :-
A = ( 360 + 144 + 180 ) ft²
A = 684 ft²
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