Diketahui diameter kerucut 10cm.dan panjang garis pelukisnya 13cm.volume kerucut adalah...

R = 1/2.d
r = 1/2.10
r = 5 cm
cari nilai t:
s^2 = r^2+t^2
13^2 = 5^2+t^2
169 = 25+t^2
t^2 = 169-25
t = akar 144
t = 12 cm

V = 1/3.phi.r^2.t
V = 1/3.phi.5^2.12
V = 100phi cm3