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r- promień stożka
h- wysokość stożka
l=4
r=½l
r=½*4
r=2
h=l√3/2
h=4√3/2
h=2√3
V=1/3πr²*h
V=1/3π*2²*2√3
V=1/3π*4*2√3
V=8√3/3π [cm³]
Pc=πrl+πr²
Pc=π*2*4+π2²
Pc=8π+4π
Pc=12π [cm²]