Sir Mike Ambrose is the author of the question.
The width of the rectangle is;
(5/2)+(11/2)
= 8 cm
Area Rectangle is;
12*8 = 96 cm²
Area Green is;
½(7*12)sin((90-atan(5√(3)/11)))
= 33 cm²
Area green ÷ Area rectangle is;
33 ÷ 96
= 11/32
= 0.34375
= 0.34 to 2 decimal places.
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