Volume kerucut jika diameter alas 24cm adalah4224cm³.tinggi kerucut adalah

v = 1/3 phi x r x r x t
= 1/3 x 1/4 phi x d x d x t
4224 = 1/12 phi x 24 x 24 x t
4224 x 12 / 24 = phi x 24 x t
4224 x 1/2 : 24 = phi x t
4224 x 1/48 : phi = t
88/phi = t
88 x 7/22 = t
t = 4 x 7
= 28