Sir Mike Ambrose is the author of the question.
Let the single side length of the square be 3 units.
Therefore Area square is;
3² = 9 square units.
Area green is;
½((1, 2) (7/3, 5/3) (3, 3) (3/5, 12/5) (1, 2))
= ½((-45+30+63)/15)
= ½(48/15)
= 24/15
= (8/5) square units.
= ⅕(8) square units.
It implies;
Area green ÷ Area square is;
(8/5) ÷ 9
= 8/45
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