Answer:
Area of Region in between = πr² - L * W
Explanation:
Assuming that the rectangle is inside the circle then it would be a mixture of the two area formulas.
Area of a rectangle: Length * Width
Area of a Circle = π(radius)²
Since the rectangle is inside the circle, we can subtract the areas to find the shaded region that is not overlapped by the rectangle.
Area of Region in between = Area of a Circle - Area of a rectangle
Area of un-overlapped Region = πr² - L * W