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Vt : Vb
πr²t : 4/3 πr³
πr²(2r): 4/3 πr³
2πr³ : 4/3 πr³
6 : 4
3 : 2
perbandingan Vt:Vb=3:2
a). Volume bola =2/3 × 396 = 264 cm³
b).
Lt : Lb
2πr(r+t): 4πr²
2πr(r+2r):4πr²
2πr²+4πr²: 4πr²
6πr² : 4πr²
6 : 4
3 : 2
Jadi perbandingan Lt : Lb = 3:2
5). L=204,1 cm², s=13 cm
L=πrs
r=L:πs=204,1:(3,14×13)=204,1:40,82= 5 cm
V es krim yg menyempul
=V ½ bola
=2/3 πr³
=2/3 × 3,14 × 5³
=261⅔ cm³
≈261,67 cm³