The area of the ring is 65.94 square units.
How to find the shaded area?
We have a ring, for a ring of radius R and interior radius r, the area is given by:
Area = pi*(R² - r²)
Where pi = 3.14
The radius is 11 units, and the interior radius is 10 units, then the area will be:
area = 3.14*(11² - 10²)
area = 3.14*(121 - 100)
area = 65.94