Odpowiedzi

2010-02-07T22:23:40+01:00
H=3√3
V=⅓*π9*3√3=9√3π
Pp=9π+18π=27π
2010-02-07T22:27:25+01:00
R = 3cm

Trzeba to obliczyć z wzoru na trójkąt 30*,60*,90* :)

l = 2r
l = 2*3
l = 6cm

h = l√3/2
h = 6√3/2
h = 3√3

Pb = πrl
Pb = π3*6
Pb = 18πcm²

V = 1/3πr²h
V = 1/3π3²*3√3
V = 1/3π9*3√3
V = 1/3π27√3
V = 27√3π/3
V = 9√3πcm³