Question

Lc= 20pi cm

Dc=?
Ac=?​

Answer 1

Răspuns:

Explicație pas cu pas:

L = 20π cm

2πR = 20π ⇒ R = 10 cm

D = 2R = 2 × 10 = 20 cm

A = πR^2= π × 10^2 = 100π cm^2

Answer 2

$\it L_c=20\pi=d\cdot\pi \Rightarrow d=20\ cm\\ \\ \mathcal{A}=\pi\cdot R^2=\pi\cdotg(d:2)^2=\pi\cdot(20:2)^2=\pi\cdot10^2=100\pi\ cm^2$