r1/r2 = t1/t2 = s1/s2 = 5/15 = 1/3
Diperoleh r2 = 3r1 dan t2= 3t1,
Sehingga untuk mencari volume:
V2 = π(r2)2t2
V2 = π(3r1)2(3t1)
V2 = 27π(r1)2t1
V2 = 27V1
V2 = 324π cm3
b) Diketahui t1 = 10 cm, L1 = 200π cm3, t2 = 5 cm. Maka,
r1/r2 = t1/t2 = 5/10 = 1/2