1.8=3.14x^2

Solution for 1.8=3.14x^2 equation:

1.8=3.14x^2

We move all terms to the left:

1.8-(3.14x^2)=0

We get rid of parentheses

-3.14x^2+1.8=0

a = -3.14; b = 0; c = +1.8;
Δ = b2-4ac
Δ = 02-4·(-3.14)·1.8
Δ = 22.608
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-\sqrt{22.608}}{2*-3.14}=\frac{0-\sqrt{22.608}}{-6.28}
=-\frac{\sqrt{}}{-6.28}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{22.608}}{2*-3.14}=\frac{0+\sqrt{22.608}}{-6.28}
=\frac{\sqrt{}}{-6.28}
$