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T= 20cm
Ditanya: Luas tabung TANPA tutup
Dijawab:
L alas: 22/7 x 10,5cm x 10,5cm
346,5 cm²
L selimut: Keliling alas x T
22/7 x 21cm x 20cm
1320cm²
L alas + L selimut
346,5 cm² + 1320cm²
1666,5 cm²