A=2(3.14)r2r

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Solution for A=2(3.14)r2r equation: 



=2(3.14)A2A

We move all terms to the left:

-(2(3.14)A2A)=0



We calculate terms in parentheses: -(2(3.14)A2A), so:

2(3.14)A2A

We multiply parentheses

6.28A^2

Back to the equation:

-(6.28A^2)



We get rid of parentheses

-6.28A^2=0

a = -6.28; b = 0; c = 0;
Δ = b2-4ac
Δ = 02-4·(-6.28)·0
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$A=\frac{-b}{2a}=\frac{0}{-12.56}=0$

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