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718 2/3 x 3/2 x 7/22 = r pngkt 3
343 = r pngkt 3
7 = r
itu menurut ku kalau salah mohon koreksinya yaa
= 2/3πr³
718 2/3 = 2156/3
2156/3 = 22/7 × 2/3 × r³
2156/3 = 44/21r³
r³ = 2156/3 per 44 × 21
r³ = 343
r = ∛343
r = 7 cm