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t = 70cm
r = ?
V = πr² t
88.000 = 22/7 x r² x 70
88.000 = 220r²
r² = 400
r = 20
V=π×r²×t
88.000=22/7×r²×70
88.000=220r²
r²=88.000/220
r²=400
r=√400
r=20cm