A=4(3.14)r2

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Solution for A=4(3.14)r2 equation: 



=4(3.14)A2

We move all terms to the left:

-(4(3.14)A2)=0



We calculate terms in parentheses: -(4(3.14)A2), so:

4(3.14)A2

We multiply parentheses

12.56A^2

Back to the equation:

-(12.56A^2)



We get rid of parentheses

-12.56A^2=0

a = -12.56; b = 0; c = 0;
Δ = b2-4ac
Δ = 02-4·(-12.56)·0
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$A=\frac{-b}{2a}=\frac{0}{-25.12}=0$

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