Odpowiedzi

2009-12-11T14:25:02+01:00
V=1/3*(3.14*4*4)*4=66.98 cm3
l=2pi*r=7.28*4=29.12cm
Ppb=3.14*4*29.12=365.74cm2
2009-12-11T14:44:00+01:00
Dane:
h=4 cm
r=8 cm
V=1/3πr²h
V=1/3π8²4
V=256/3π
V≈85,3πcm³

Pb=πrl
l²=h₂×r²
l²=4²×8²
l²=80
l=√80=2√20
Pb= π8×2√20
Pb=16√20πcm²