Sir Mike Ambrose is the author of the question.
Area green total, in square unit decimal form is;
Area triangle with height 6sin(atan(3/5)) unit and base 6cos(atan(3/5)) unit + Area triangle with height 4 unit and base 4tan(atan(2/5)) unit.
= ½*6sin(atan(3/5))*6cos(atan(3/5)) + ½*4*4tan(atan(2/5))
= 7.94117647059 + 3.2
= 11.1411764706 square unit.
= 11.14 square units to 2 decimal places.
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