Top 10.624

Yellow Area and Radius

X = DE = 28 / 5 = 5.6

Simplified / Improved

Blue Area = 1 / 6

Right Triangles & Semicircle

Triangle Area = 75 / 2

Blue Area = 9.42477796077

Radius R₁ = 5

CAE = 37.6292404336

Elaborated

Solution = 1.61803398875

Radius R = 5 / 2 = 2.5