Oblicz promień koła, którego pole jest równe 36[latex] pi [/latex]cm[latex] x^{2} [/latex]

P=36cm² [latex]P= pi r^{2} [/latex] [latex]r= sqrt{ frac{P}{ pi } } [/latex] [latex]r= sqrt{ frac{36pi}{ pi } } [/latex] [latex] r=6cm [/latex]

[latex]P=pi r^{2}\ P=36pi cm^{2}\ 36pi=pi r^{2} |:pi\ r^{2}=36\ r=sqrt{36}\ r=6 cm[/latex]