sebuah tabung terbuka r= 14cm t= 20 cm ditanya: luas permukaan jawab: Lp = La+Ls
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Materi : Bangun Ruang Sisi Lengkung
Luas Permukaan Tabung
Lp = 2πr² + πdt
Lp = 2 . 22/7 . 14² + 22/7 . 28 . 20
Lp = 2 . 616 cm² + 22 . 4 . 20
Lp = 1.232 cm² + 1.760 cm²
Lp = 2.992 cm²
Semoga bisa membantu
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Penjelasan dengan langkah-langkah:
Luas Permukaan Tabung
Lp = La + Ls
= 2πr² + 2 πrt
= (2 x 22/7 x 14²) + ( 2 x 22/7 x 14 x 20)
= 1.232+ 1.760
= 2.992 cm²