diketahui sebuah tabung tanpa tutup memiliki diameter sebesar 14 cm dan tinggi 30 cm berapakah luas permukaan tabung tersebut.??
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Verified answer
r = d : 2 = 14 cm : 2 = 7 cm
LP tabung tanpa tutup
[tex]\pi \times r(r + 2t) \\ \frac{22}{7} \times 7(7 + 2(30) \: ) \\ 22(7 + 60) \\ 22(67) \\ 1.474 \: {cm}^{2} [/tex]
Penjelasan dengan langkah-langkah:
L = πr ( r + 2t )
L = 22/7 × 7 ( 7 + 2 × 30 )
L = 22 ( 67 )
L = 1.474 cm²