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8) V = π x r² x t = 22/7 x 14² x 14 = 8.624 dm³
11) V = π x r² x t = 3,14 x 10² x 30 = 9.420 cm³
12) V = π x r² x t = 22/7 x 7² x 28 = 4.312 cm³
14) V = 4.710 dm³
π x r² x t = 4.710 dm³
3,14 x 10² x t = 4.710 dm³
314 x t = 4.710 dm³
t = 4.710 dm³ : 314 dm² = 15 dm
15) V = 1.848 dm³
π x r² x t = 1.848 dm³
22/7 x r² x 12 = 1.848 dm³
22/7 x r² = 1.848 dm³ : 12 dm
22/7 x r² = 154 dm²
r² = 154 dm² : 22/7 = 154 dm² x 7/22 = 49 dm²
r = √49 dm² = 7 dm