Sir Mike Ambrose is the author of the question.
Area blue is;
Area triangle with side 8.81712800181 cm and 7.80776406404 cm, and angle 19.3341412463°
= ½(8.81712800181*7.80776406404)sin19.3341412463
= 11.3960010284
≈ 11.40 cm²
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