Răspunsuri

2014-05-10T18:07:59+03:00
L=2pi*r
l=2*pi*4/9=8pi/9
b)
l=2*pi*(9+2)/3=2*pi*11/3=22pi/3
2014-05-10T18:15:23+03:00
A) Lcerc = 2 \pi r
    Lcerc = 2· \pi ·0,(4)
    Lcerc = 2· \frac{4}{9} · \pi
    Lcerc =  \frac{8}{9}  \pi           

si lasi asa cu  \pi ca nu are nimic
b) Lcerc =2 \pi r
    Lcerc = 2· \pi ·3 \frac{2}{3}
    Lcerc = 2· \frac{11}{3} · \pi
    Lcerc =  \frac{22}{3}  \pi