Odpowiedzi

Najlepsza Odpowiedź!
2010-02-01T18:54:00+01:00
P kuli = 4πr²
r1 = 4
r2 = 2
P1 = 4π4² = 64π
P2 = 4π2² = 16π
Pc = 64π + 16π = 80 π

80 π = 4πr² | :4π
20 = r²
r = 2√5 cm
3 2 3
2010-02-01T18:55:03+01:00
V=4πr³/3, więc:

v1=4π8³/3=2048π/3
v2=4π4³/3=256π/3

v1+v2=2304π/3

V=4πR³/3
2304π/3=4πR³/3
R³=576
R=³√576
2 3 2