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2310 = 22/7 . r² . 15
r²= 49
r = 7
Bola terbesar yg dapat dimasukkan dalam tabung mempunyai jari - jari yg sama dgn tabung yaitu 7
Vol bola = 4/3 . πr³ = 4/3 . 22/7. 7³
La=2310:15
=154cm²
r²=154÷22/7
r²=154×7/22
r=√49=7cm
vol bola = 4/3 × 22/7 × 7³
= 1437,3 cm³