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= πr² x t
6930 = 22/7 r² x 5
1386 = 22/7 r²
441 = r²
21 = r
jari-jari alas tabung adalah 21 dm
r = v / phi × t
= 6930/22/7 × 5
= 315/7 × 5
= 45 × 5
= 225 dm