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r = 5 cm
garis pelukis = 13 cm
ditanya : v..... ?
jawab : ~ t = √13²-5²
= √169-25
= √144
= 12 cm
~ v = 1/3 × π × r² × t
= 1/3 × 22/7 × 5 × 5 × 12
= 22/7 × 25 × 4
= 78, 571 × 4
= 314,286 cm²
jadi, volumenya adalah 314, 286 cm². maaf kalau salah... :)