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V tabung = π x r² x t
1540cm³ = x r² x 10
1540cm³ : 10 = x r²
154cm³ = x r²
154 x = r² x ⇒154 dicoret dengan 22 ,154 menjadi 7, dan 22 menjadi 1
7 x 7 = r²
49 = r²
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