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V = π × r² × t
2200 = 22/7 × r² × 7
2200 × 7/22 : 7 = r²
100 × 7 : 7 = r²
700 : 7 = r²
100 = r²
√100 = √r²
10 = r
d = 2 × r
= 2 × 10 cm
= 20 cm