7. diket: r; 21dm
t: 45dm
ditanya: luas permukaan tabung
jawab: 2πr (r+t)
: 2. 22/7 . 21 (21+45)
: 2. 22. 3 (66)
: 8712dm²
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7. diket: r; 21dm
t: 45dm
ditanya: luas permukaan tabung
jawab: 2πr (r+t)
: 2. 22/7 . 21 (21+45)
: 2. 22. 3 (66)
: 8712dm²