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22/7 x 7 x 7 x 20
= 22 x 7 x 20
= 3080 cm³
2) V.tabung = luas alas x tinggi
9240 = 22/7 x r² x 15
9240 x 7/22 : 15 = r²
196 = r²
r = 14
Semoga membantu :D