2/3.14=r*r

Solution for 2/3.14=r*r equation:

2/3.14=r*r

We move all terms to the left:

2/3.14-(r*r)=0

We add all the numbers together, and all the variables

-(+r*r)+2/3.14=0

We get rid of parentheses

-r*r+2/3.14=0

We multiply all the terms by the denominator


-(r*r)*3.14+2=0

We add all the numbers together, and all the variables

-(+r*r)*3.14+2=0

We multiply parentheses

-3.14r^2+2=0

a = -3.14; b = 0; c = +2;
Δ = b2-4ac
Δ = 02-4·(-3.14)·2
Δ = 25.12
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-\sqrt{25.12}}{2*-3.14}=\frac{0-\sqrt{25.12}}{-6.28}
=-\frac{\sqrt{}}{-6.28}
$
$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{25.12}}{2*-3.14}=\frac{0+\sqrt{25.12}}{-6.28}
=\frac{\sqrt{}}{-6.28}
$