Dik : K alas kerucut = 62.8 cm t kerucut = 12 cm. Dit : V kerucut = ?

Keliling alas = 2 × pi × r
62,8 = 2 × 3,14 × r
62,8 / 6,28 = r
10 = r

Jadi r Kerucut adalah 10 cm.

V kerucut = 1/3 × pi × r × r
= 1/3 × 3,14 × 10 × 10
= 1/3 × 314
= 104,7 cm3