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= × 7² × 18
= 22 × 7 × 18
= 2.772 cm³
= × La × t
= × π × r² × t
= × × 7² × 18
= 22 × 7 × 6
= 924 cm³
V = -
V = 2.772 - 924
V = 1.848 cm³