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To find the area of the rectangle within the composite shape, you need to subtract the area of the triangle from the total area of the composite shape.
Total area of composite shape: 40 square inches
Area of triangle: (1/2) base x height = (1/2)(5)(8) = 20 square inches
Area of rectangle: Total area - Area of triangle = 40 square inches - 20 square inches = 20 square inches
Therefore, the area of the rectangle within the composite shape is 20 square inches.
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