Réitigh piR^2=28.26

$$\pi R ^ { 2 } = 28.26$$

Réitigh do R.

$$R = \frac{3 \sqrt{\frac{314}{\pi}}}{10} \approx 2.999239468$$

$$R = -\frac{3 \sqrt{\frac{314}{\pi}}}{10} \approx -2.999239468$$

Céimeanna tríd an bhFréamh Chearnach a Fháil

Roinn an dá thaobh faoi \pi .

$$\frac{\pi R^{2}}{\pi }=\frac{28.26}{\pi }$$

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

$$R^{2}=\frac{28.26}{\pi }$$

Roinn 28.26 faoi \pi .

$$R^{2}=\frac{1413}{50\pi }$$

Tóg fréamh chearnach an dá thaobh den chothromóid.

$$R=\frac{471}{5\sqrt{314\pi }} R=-\frac{471}{5\sqrt{314\pi }}$$

Céimeanna ag Baint Úsáid as an bhFoirmle Chearnach

Bain 28.26 ón dá thaobh.

$$\pi R^{2}-28.26=0$$

Tá an chothromóid seo i bhfoirm chaighdeánach: ax^{2}+bx+c=0. Cuir \pi in ionad a, 0 in ionad b, agus -28.26 in ionad c san fhoirmle chearnach, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$R=\frac{0±\sqrt{0^{2}-4\pi \left(-28.26\right)}}{2\pi }$$

Cearnóg 0.

$$R=\frac{0±\sqrt{-4\pi \left(-28.26\right)}}{2\pi }$$

Méadaigh -4 faoi \pi .

$$R=\frac{0±\sqrt{\left(-4\pi \right)\left(-28.26\right)}}{2\pi }$$

Méadaigh -4\pi faoi -28.26.

$$R=\frac{0±\sqrt{\frac{2826\pi }{25}}}{2\pi }$$

Tóg fréamh chearnach \frac{2826\pi }{25}.

$$R=\frac{0±\frac{3\sqrt{314\pi }}{5}}{2\pi }$$

Réitigh an chothromóid R=\frac{0±\frac{3\sqrt{314\pi }}{5}}{2\pi } nuair is ionann ± agus plus.

$$R=\frac{471}{5\sqrt{314\pi }}$$

Réitigh an chothromóid R=\frac{0±\frac{3\sqrt{314\pi }}{5}}{2\pi } nuair is ionann ± agus míneas.

$$R=-\frac{471}{5\sqrt{314\pi }}$$

Tá an chothromóid réitithe anois.

$$R=\frac{471}{5\sqrt{314\pi }} R=-\frac{471}{5\sqrt{314\pi }}$$