A=1/2*3.14*r^2

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Solution for A=1/2*3.14*r^2 equation: 



=1/2*3.14A^2

We move all terms to the left:

-(1/2*3.14A^2)=0



Domain of the equation: 2*3.14A^2)!=0

A!=0/1

A!=0

A∈R



We get rid of parentheses

-1/2*3.14A^2=0

We multiply all the terms by the denominator


-1!=0

There is no solution for this equation

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