Răspunsuri

2014-07-17T13:09:38+03:00
Lc=10π

Lc=2πR

2πR=10π

2R=10
R=5

Ac=πR²= 5²π= 25π
2014-07-17T15:55:15+03:00
Perimetrul cercului = 2πr
2πr=10π
r=10:2
r=5

aria= π r²
aria=π5²
aria=25π