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Verified answer
Menentukan jari jari alask = 2 π r
88 = 2 x ²²/₇ x r
r = 88 ÷ (2 x ²²/₇)
r = 14 cm
menentukan volume tabung
v = π r² t
v = ²²/₇ x 14² x 20
v = 12.320 cm³