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t: 18
v = 1/3. luas alas.tinggi
1/3. 3.14 . 5 kuadrat.. 18
1/3 . 3,14 . 25 . 18
1/3 . 18 = 6
1. 3,14 . 25 . 6
= 80, 384
penyelesaian ;
V = × × r² × t
= × 3,14 × 5 × 5 ×18
= 3,14 × 5 × 5×6
=471,0