Sebuah tabung mempunyai tinggi 30 cm dan panjang diameter alas 24 cm. Luas permukaan tabung tersebut adalah....cm²
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Jawab:
Luas permukaan tabung = 2πr (r + t)
2 x 3.14 x 12(12+30)
6.28 x 12(42)
6.28 x 504
= 3165.12cm²
Jawaban:
Diket :
Tinggi = 30
Diameter = 24
Jari-jari = 24 : 2 = 12
LPT = ...?
Penyelesaian :
LPT = 2πr(r + t)
LPT = 2 × 3,14 × 12 × (12 + 30)
LPT = 75,36 × 42
LPT = 3165,12