S=4*3.14*r*r

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Solution for S=4*3.14*r*r equation: 



=4*3.14S*S

We move all terms to the left:

-(4*3.14S*S)=0

We add all the numbers together, and all the variables

-(+4*3.14S*S)=0

We get rid of parentheses

-4*3.14S*S=0

Wy multiply elements

-12S^2=0

a = -12; b = 0; c = 0;
Δ = b2-4ac
Δ = 02-4·(-12)·0
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$S=\frac{-b}{2a}=\frac{0}{-24}=0$

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