Răspunsuri

2014-05-15T19:43:07+03:00
alculati aria discului cu diametrul de 2,(3) cm si diametrul 2 supra pi 
2014-05-15T19:48:59+03:00
2,(3)=2 intregi 3/9=   2 intregi  1/3=   7/3

d=2R
R=d/2= 7/3/2=  7/3 *1/2=  7/6

A=πR²= (7/6)² π=  49/36 π=  1,361 π


d=2 /π
π=3,14
d=2/3,14
R=d/2
R=2/3,14/2=  2/3,14 *1/2=  1/3,14
3,14= 3 intregi 14/100= 3 intregi 7/50=  157/50
R=1/157/50=  50/157

A=πR²= (50/157)²π=  2500/ 24 649 π= 0,101π