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2r=l
r+2r=15 cm
3r=15cm
r=5cm
l=2r
l=10cm
h²+r²=l²
h²+25=100
h²=75
h=5√3 [cm]
v=?
v=1/3Pp*h
v=1/3πr²h=1/3*25*5√3=41 2/3 [cm³]