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2r=12cm to r=12/2=6cm
to Pp=πr²=6²π=36π cm²
wiadomo ze:
Pb=5·Pp
Pb=5·36π=180π cm²
wzor na Pb=πrl
180π=π·6·l /:6π
30cm =l --->dl. tworzacej stozka
6²+h²=30²
h²=900-36
h=√864=12√6 cm--->wysokosc stozka
Objetosc bryly wynosi zatem:
V=1/3Pp·h=1/3·36π·12√6=144√6 π cm³
Ppodst=r
Ppodst=36=*6*l
l=30 -> tworząca stożka
6+h=30
h=864
h=
h=12 -> wysokość stożka
V=1/3Ppodst*h
V=1/3*36*12=144