Three squares are placed as shown. What fraction of the total area is green?

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The green fraction is (18√3-28)/47, which approximately 6,8%.

Solution by BENE.


Trinity can be a nice story
As the little shamrock of Ireland
With three little leaves a lonely plant
Grows in the green and lively Land
And so on Saint Patrick’s day
The shamrock will bring you luck anyway
This trinity from green Erin
Is like a precious gem
On it’s fragile stem


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