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Dik : r = 3 cm

Dit : a. Perubahan volume jika r + 1
       b. Perubahan volume jika r + 2
       c. Perubahan volume jika 2r
Jawab :
[tex] v_{bola} [/tex] = 4/3 . [tex] \pi [/tex] . [tex] r^{3} [/tex]
                               = 4/3 . 3,14 . [tex] 3^{3} [/tex]
                               = 4/3 . 3,14 . 27
                               = 12,56 . 27/3
                               = 12,56 . 9
                               = 339,12 [tex] cm^{3} [/tex]
a. jika r + 1 = 3 + 1 = 4 cm
4/3 . 3,14 . [tex] 4^{3} [/tex]
12,56 . 64 . 1/3
803,84 . 1/3
=267,95 [tex] cm^{3} [/tex] (aslinya 267,946666666)
b. jika r + 2 = 3 + 2 = 5 cm
4/3 . 3,14 . [tex] 5^{3} [/tex]
12,56 . 125 . 1/3
1570/3
=523,33 [tex] cm^{3} [/tex]
c. jika 2r = 2 . 3 = 6 cm
4/3 . 3,14 . [tex] 6^{3} [/tex]
12,56 . 216 . 1/3
2712,96 . 1/3
= 904,32 [tex] cm^{3} [/tex]

Maaf kalau ada yang salah