top 10.921

Orange Area = 42.3628527636

Shaded Area = 17.1750554397

X = AD = 10

Shaded Area = 6

X = DE = 8.42614977318

Prove that X = a + b + c

Major Radius R = 1.86602540378

R = 2.1 = 21 / 10

Pink Rectangle Area = 11

X = DF = 19