Area of a circle = π x radius ^2 = π r^2
Replacing with the values given:
A C = π 12^2 = 452.39 cm^2
Area of a rectangle: Length x width
A R = 11 x 5 = 55 cm^2
To find the shaded region, subtract the area of the rectangle to the area of the circle:
452.39-55 = 397.39 cm^2
