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2 x luas alas + Luas selimut tabung
2 π r ( r + t )
2 x 3,14 x 10 ( 10 +35 )
62,8 ( 45 ) = 2826 cm ^2
ini kalau dicari luas permukaan tabung
r = 10
Luas tabung = 2πr² + 2πrt
= 2πr (r+t)
= 2 * 3,14 * 10 (10+35)
= 62,8 (45)
= 2826 cm²
ini jika tanpa tutup
L = πr² + 2πrt
= πr (r + 2t)
= 3,14 * 10 (10 + 2*35)
= 31,4 (80)
= 2512 cm²
ini jika hanya dicari luas selimutnya saja
L = 2πrt
= 2 * 3,14 * 10 *35
= 2198 cm²