Răspunsuri

2014-05-08T22:56:50+03:00
Lungime cerc =2pi R adica 2x4 pi lungime cerc=8pi
2014-05-08T22:57:36+03:00
Lungimea cercului=2piR =>2Pi·8cm=16·pi cm Pi=3,14 =>16·3,14=50,24cm