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88 = 2×22/7×r
88 = 44/7×r
r= 88×7/44
r= 616/44
r= 7
pakai rumus volume tabung
V = phy.r2.t
= 22/7×14×14×20 (14 DIBAGI 7)
= 22×2×14×20
= 44×280
=12.320
JADI VOLUME TABUNG YAITU 12.320cm3
Jari jari lingkaran = 28 ÷ 2 = 14
Volume = 22/7 × 14 × 14 × 20 = 12320 cm3