Hello :
f(r) = πr².... r <span> <span>><span> 0
</span></span></span>the domain is : <span>] 0; + ∞[<span> </span></span>
18 post it notes are needed to cover the entire bored.
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Give letters, as in the attached image.
The triangles ABE and CDE are similars (AAA). In particular 
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