Réitigh 22176=pir^2

$$22176 = \pi r ^ { 2 }$$

Réitigh do r.

$$r=12\sqrt{\frac{154}{\pi }}\approx 84.016903276$$

$$r=-12\sqrt{\frac{154}{\pi }}\approx -84.016903276$$

Céimeanna tríd an bhFréamh Chearnach a Fháil

Athraigh na taobhanna ionas go mbeidh na téarmaí inathraitheacha ar fad ar an taobh clé.

$$\pi r^{2}=22176$$

Roinn an dá thaobh faoi \pi .

$$\frac{\pi r^{2}}{\pi }=\frac{22176}{\pi }$$

Má roinntear é faoi \pi cuirtear an iolrúchán faoi \pi ar ceal.

$$r^{2}=\frac{22176}{\pi }$$

Tóg fréamh chearnach an dá thaobh den chothromóid.

$$r=\frac{1848}{\sqrt{154\pi }} r=-\frac{1848}{\sqrt{154\pi }}$$

Céimeanna ag Baint Úsáid as an bhFoirmle Chearnach

Athraigh na taobhanna ionas go mbeidh na téarmaí inathraitheacha ar fad ar an taobh clé.

$$\pi r^{2}=22176$$

Bain 22176 ón dá thaobh.

$$\pi r^{2}-22176=0$$

Tá an chothromóid seo i bhfoirm chaighdeánach: ax^{2}+bx+c=0. Cuir \pi in ionad a, 0 in ionad b, agus -22176 in ionad c san fhoirmle chearnach, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$r=\frac{0±\sqrt{0^{2}-4\pi \left(-22176\right)}}{2\pi }$$

Cearnóg 0.

$$r=\frac{0±\sqrt{-4\pi \left(-22176\right)}}{2\pi }$$

Méadaigh -4 faoi \pi .

$$r=\frac{0±\sqrt{\left(-4\pi \right)\left(-22176\right)}}{2\pi }$$

Méadaigh -4\pi faoi -22176.

$$r=\frac{0±\sqrt{88704\pi }}{2\pi }$$

Tóg fréamh chearnach 88704\pi .

$$r=\frac{0±24\sqrt{154\pi }}{2\pi }$$

Réitigh an chothromóid r=\frac{0±24\sqrt{154\pi }}{2\pi } nuair is ionann ± agus plus.

$$r=\frac{1848}{\sqrt{154\pi }}$$

Réitigh an chothromóid r=\frac{0±24\sqrt{154\pi }}{2\pi } nuair is ionann ± agus míneas.

$$r=-\frac{1848}{\sqrt{154\pi }}$$

Tá an chothromóid réitithe anois.

$$r=\frac{1848}{\sqrt{154\pi }} r=-\frac{1848}{\sqrt{154\pi }}$$