V=108π cm³
srednica podstawy 2r=12cm to r=12/2=6cm
Pb=?
V=1/3πr²·h
108π=1/3π·6²·h /:π
108=1/3·36h
108=12h /:12
h=9cm --->wysokosc stozka
z pitagorasa
r²+h²=l²
6²+9²=l²
36+81=l²
l=√117=3√13 cm ---.dl.tworzacej stozka
Pole boczne stozka
Pb=πrl=π·6·3√13 =18√13 π cm²
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V=108π cm³
srednica podstawy 2r=12cm to r=12/2=6cm
Pb=?
V=1/3πr²·h
108π=1/3π·6²·h /:π
108=1/3·36h
108=12h /:12
h=9cm --->wysokosc stozka
z pitagorasa
r²+h²=l²
6²+9²=l²
36+81=l²
l=√117=3√13 cm ---.dl.tworzacej stozka
Pole boczne stozka
Pb=πrl=π·6·3√13 =18√13 π cm²