Răspuns :

Popemma88id

Salut!

Răspuns:[tex]8\pi \: cm[/tex] ✅

[tex] \red{aria \: = \pi {r}^{2} }[/tex]

[tex]aria = 16\pi {cm}^{2} [/tex]

[tex]r = \sqrt{16} [/tex]

r = 4 cm ✔

[tex] \red{lungime = 2\pi \times r}[/tex]

[tex]lungime = 2 \times 4 \times \pi[/tex]

[tex]lungime = 8\pi \: cm[/tex] ✔

Targoviste44id

[tex]\it \mathcal{A}_{disc}=\pi R^2=16\pi|_{:\pi} \Rightarrow R^2=16=4^2 \Rightarrow R=4\ cm\\ \\ L_{\circ}=2\pi R=2\pi\cdot4=8\pi\ cm[/tex]

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