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Green Quadrilateral Area = 15

Shaded Octagon Area = 6

Height H = CE = 6

Ratio of AE to DG = AE / DG = 1

Alpha = ABD = 15

Orange Area = 18.6154150604

Blue Square Area = 20 u ^ 2

Semicircle Radius R = 17

X = Diagonal AC = 4

X = AED = 18