3 4 1 2 1 2 b. V = / / r + r t + / r t 2 . 3 3 = / 3,14. 6 + 3,14. 6 . 11 + / 3,14. 6 . 8 2 2 2 1 3 3 . 3 . = 452,16 + 1243,44 + 301,44 = 1997,04 Jadi Volum Benda itu = 1997,04 mm 3