Dat destroyer Number 10

[AM4EVA]

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Hi all
When i first saw this problem i thought.that the radius would be 1 ( for the square) but the solution says 2
Can u clarify please

 

[KyoPhan]

A= (square) - circle
A= (2x2) - TT 1^2
A= 4 -TT

 

[AM4EVA]

Thx so much!!!

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