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Perimeter = 26 ⇒ CMD = 90°

Show: Angle CMD = 90°

Another Approach

Blue Square Area = 49 / 5

Minimal Blue Area = 7.875 = 63 / 8

Green = 495 / 16 = 30.9375

X = BE = 2

X = 3.53281402365

Missing Angle ACD = 11°

AB = 123.077422576

    

X = 110.286853195