Sir Mike Ambrose is the author of the question.
Area Green is;
Area triangle two lengths 16/3 units and ⅓√(181) units, and angle 138.0127875°, the angle they form + Area triangle two lengths 8 units and ⅓√(85) units, and angle 102.528807708°, the angle they form.
= ½(16/3)(√(181)/3)sin(138.0127875) + ½(8)(√(85)/3)sin(102.528807708)
= 8 + 12
= 20 square units.
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