Răspunsuri

2014-08-08T13:12:46+03:00
Lc=12π
Lc=2πR

12π=2πR

12=2R   =>R=6

Ac= πR²=  6²π=  36π

1 5 1
2014-08-08T13:13:22+03:00
 L cerc = 2πR 
12 π = 2πR 
R = 6 cm 

A cerc = πR²
A cerc = 6²π
A cerc = 36 π