Sir Mike Ambrose is the author of the question.
The side of area green, inscribed square is;
Let it be x.
Therefore;
1.11496246101x + 0.82101781219x = 27.3672604063
1.9359802732x = 27.3672604063
x = 14.1361256544 cm
Therefore;
Exact perimeter of green area in decimal cm is;
4(14.1361256544)
= 56.5445026176 cm
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