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v=100 cm3
a=5 cm
V=1/3 Pp*h
Pp=5*5=25
100=1/3*25*h
300=25h
h=12 cm
2.
6<pi>=l
l=2<pi>r
6<pi>=2<pi>r
r=3
Pb=2<pi>rh
6<pi>*4=24<pi>
24<pi>=2<pi>3*h
24<pi>=6<pi>h
h=4
v=100 cm3
a=5 cm
V=1/3 Pp*h
Pp=5*5=25
100=1/3*25*h
300=25h
h=12 cm
2.
6<pi>=l
l=2<pi>r
6<pi>=2<pi>r
r=3
Pb=2<pi>rh
6<pi>*4=24<pi>
24<pi>=2<pi>3*h
24<pi>=6<pi>h
h=4