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luas alas = π x r x r
= 22/7 x 28 x 28
= 2464 cm²
-volume tabung = 2464 x 20
= 49.280 cm³
luas alas = π x r²
= 22/7 x 28 x 28
= 2464 cm²
volume tabung = 2464 x 20
= 49.280 cm³