Odpowiedzi

2009-12-06T17:06:13+01:00
A) r=2

Ob = 2*pi*r = 4 * pi
P = pi * r * r = pi * 2 * 2 = 4 * pi

b) r=1/3
Ob = 2 * pi * r = 2/3 * pi
P = pi * r * r = pi * 1/3 * 1/3 = 1/9 * pi

c) r = 2pi
Ob = 2 * pi * r = 2 * pi * 2pi = 4 * pi * pi = 4 pi^2
P = pi * r * r = pi * 2pi * 2pi = 4 * pi^3