Question

Aria unui cerc este de 16 π cm^2 .Aflati lungimea cercului.Va rog mult urgent

Answer 1

 

$\displaystyle\bf\\Formula~pentru~aria~cercului~este:\\\\A=\pi R^2\\\\\pi R^2=16\pi~~\Big|:\pi\\\\R^2=16\\\\R^2=4^2\\\\\boxed{\bf R=4~cm}\\\\Formula~pentru~lungimea~cercului~este:\\\\L=2\pi R\\\\L=2\pi\times4\\\\\boxed{\bf L=8\pi~cm}$