mencari volume kerucut diameter di perbesar 3 kali

Rumus volume kerucut =
[tex] \frac{1}{3} \times luas \: alas \: \times tinggi \\ \\ \frac{1}{3} \times \pi \: {r}^{2} \: \times tinggi \\ [/tex]
= 1/3 × pi × (3/2r)^2 × t
= 1/3 × pi × 9/4r^2 × t
= 3/4 × pi × r^2 × t