First, we have to calculate the area of each circle.
Area of a circle (A) = π r^2
Where :
r = radius
Big circle area (A1)
A1 = π 27^2 = 2,290.22
Small circle area (A2)
A2= π 20^2 = 1,256.64
A2 is the area of the white region = 1,256.22
To find the area of the blue region subtract A2 to A1
A1-A2 = 2,290.22-1,256.22 = 1,034