volume sama. jika tinggi t1 : t2 = 9 : 4, maka perbandingan jari jari r1 : r2 adalah...

Volume 1 = Volume 2
phi× r1^2 × t1 = phi × r2^2 × t2 ..... (phi dicoret)
r1^2 × 9 = r2^2 × 4
r1^2 × 3^2 = r2^2 × 2^2
(r1 × 3)^2 = (r2 × 2)^2 ....... (kuadrat dihilangkan)
r1 = 2/3 r2
r2 = 3/2 r1

r1 : r2 = 2/3 : 3/2