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Verified answer
Diameter = 14 CmR = 7 Cm
Volume = phi x r x r x T
4,312 = 22/7 x 7 x 7 x T
4,312 = 154T
T = 4,312/154
T = 28 Cm (D)
Maaf kalau benar ya kak, soalnya dikelas memang saya gak terlalu cerdas.