Top 10.876

Angle BDC = 60

Shaded Area = 4.28318530718

Side S = 20

tan X = 0.609611796798

X = BD = 4.24264068712

X = CBE = 30

Angle ABC = 45

Angle ADB = 22.5

Circle Area = 45.8352191003

Blue Triangle Area = 6