Question

lungimea cercului cu diametrul de 10cm=)plizz

Answer 1

Lungimea=2πR
Diametru=2xRaza
2xR=10:2
R=5
2π5=10πcm

Answer 2

$d=10 \ cm \\ L_o=2 \pi R \\ R= \frac{d}{2} \\ R= \frac{10 \ cm}{2} \\ R=5 \ cm \\ L_o=2 \pi 5 \ cm \\ \boxed{L_o=10 \pi }.$