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volume = πr²t r?
L selimut = 2πrt
2πrt = L selimut
2×22/7×r×10 = 4cm
440/7×r = 4
r = 4/440/7 = 4×7/440 = 7/10 = 0,7
volume πr²t
22/7×0,7×0,7×10
107,8/7(sama sama dikalikan 10 untuk menghilangkan koma ketika akan dibagi) 1078/70 = 15,4cm³