Question

7 Un cerc are lungimea egală cu 67 cm. Discul corespunzător are aria egală cu A 6π cm² B 36 cm² C 9π cm² D 127 cm².​

Answer 1

Răspuns:

Form Lcerc=2pi×raza=> raza=6/2=3 cm

A cerc=pi×raza²=>Acerc=3²=9×pi cm²

Answer 2

$\it L_c=2\pi R=6\pi\Big|_{:(2\pi)} \Rightarrow R=3\ cm\\ \\ \\ \mathcal{A}_{disc}=\pi R^2=\pi\cdot3^2=9\pi\ cm^2\\ \\ \\ R\breve aspunsul\ corect\ este\ \ C.\ 9\pi\ cm^2$