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Make r the subject of the formula:

A= πr²

User Kierans
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2 Answers

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Make r the subject of the formula: A= πr²-example-1
User Ben Sch
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Firstly, divide both sides by pi:
(A)/(\pi)=r^2

Lastly, square root both sides of the equation and your answer will be
\sqrt{(A)/(\pi)}=r

User Afeesudheen
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