Final answer:
The area of the rectangle cannot be determined based on the given information.
Step-by-step explanation:
The area of the unshaded region is 19.5cm². To find the area of the rectangle, we need to subtract the area of the unshaded region from the total area of the rectangle. Let's assume that the area of the unshaded region is represented by the yellow shaded portion in the rectangle. So, the area of the rectangle would be:
Area of rectangle = Total area - Area of unshaded region
We are given that the area of the unshaded region is 19.5cm². Since there are no markings or dimensions given for the rectangle, we cannot directly calculate its area. Therefore, we cannot determine the exact area of the rectangle from the information provided.