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r=6
h=8
Pp=πr²
Pb=πrl
π=3,14
l wyliczamy z twierdzenia pitagorasa
l²=r²+h²
l²=36+64
l=√100
l=10
Pp=3,14*6²=113,04
Pb=3,14*6*8=150,72
Pc=Pp+Pb
Pc=113,04+150,72=263,72cm²
b)
h=7
d=10
r=5
Pp=πr²
Pb=πrl
π=3,14
l wyliczamy z twierdzenia pitagorasa
l²=r²+h²
l²=25+49
l=√74
l=8,6
Pp=3,14*5²=78,5
Pb=3,14*5*8,6=135,02
Pc=Pp+Pb
Pc=78,5+135,02=213,52cm²
c)
h=7
d=4√3
r=2√3
Pp=πr²
Pb=πrl
π=3,14
l wyliczamy z twierdzenia pitagorasa
l²=r²+h²
l²=12+49
l=√61
Pp=3,14*2√3²=37,68
Pb=3,14*2√3*√61=6,28√183=84,95
Pc=Pp+Pb
Pc=37,68+84,95=122,63