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1 / 4 = r²1 / r²2
1r² = 4r²
Jadi r1 : r2 = 1 : 4
b) Luas selimut 1 = 2.π.r.t = 2.1 =2
Luas selimut 2 = 2.π.r.t = 2.4 = 8
V1 : V2
πr²t : πr²t
π(r)²t : π(4r)²t
(r)² : (4r)²
√r² : √(4r)²
r : 2 r
1 : 2
Jadi r1:r2=1:2
b).
Ls1 : Ls2
2πrt : 2πrt
2π(r)t : 2π(2r)t
1 : 2
Jadi Ls1:Ls2=1:2