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K = 66
2πr = 66
πr = 33
22/7 r = 33
r = 33 x 7/22
r = 10.5 cm atau 21/2 cm
Maka,
66=2.22/7.r
66=44/7.r
66.7/44=r
462/44=r
10,5=r
V=1/3.22/7.10,5.10,5.30
V=1/3.22/7.3307,5
V=72765/21
V=3465 cm pangkat 3