dik= kerucut, keliling alas 62,8 cm, tinggi 12 cm, π 3,14, dit volume kerucut

K= 2.pi.r
62,8= 2.3,14.r
62,8=6,28.r
62,8/6,28=r
10=r
V=1/3.pi.r2.t
v=1/3.3,14.10.10.12
=314.4
=1256 cm3