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Tekill · Answer 1 · 2016-12-23T11:51:04+0000

4. Area of a disk of diameter D :
$A= \pi*(D/2)^2\approx3.14*(3.5)^2=38.465$

Assuming that you use the usual convention of rouding 5 to the greater number :

A=38.47

5. Diameter of a circle of radius r :
$A= \pi D=47$ hence
$D\approx47/3.14\approx14.97$

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