

Unsur-unsur BRSL
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Mathematics
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9th Grade
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juliana hafid
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6 Slides • 1 Question
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Unsur-unsur BRSL
Unsur-unsur Tabung, Kerucut dan Bola

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Pengertian
Tabung atau silinder adalah bangun ruang tiga dimensi yang dibentuk oleh dua buah lingkaran identik yang sejajar dan sebuah persegi panjang yang mengelilingi kedua lingkaran tersebut. Tabung memiliki 3 sisi dan 2 rusuk.
Kedua lingkaran disebut sebagai alas dan tutup tabung serta persegi panjang yang menyelimutinya disebut sebagai selimut tabung.
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Model Tabung
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rumus menghitung luas tabung
Berikut ini rumus-rumus dari luas tabung:
Volume tabung =luas alas x tinggi
Luas alas = luas lingkaran = πr2
Volume tabung = π r 2 t
Keliling lingkaran alas atau tutup = 2πr Luas Selimut= 2πrt
Luas Permukaan Tabung = 2 x luas alas + Luas selimut tabung
Luas Permukaan Tabung = 2 (π r 2 )+ 2 π r t = 2 π r ( r + t )
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contoh menghitung Luas permukaan tabung,
L= 2πr(r+t)
L= 2 x 722 x 7 (7+28)
L= 2 x 22 x 35
L= 1540 cm2
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contoh menghitung volume tabung
V= πr2t
V= 722x7x7x28
V= 22 x 7 x 28
V= 4. 312 cm3
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Multiple Choice
tabung mempunyai berapa sisi?
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Unsur-unsur BRSL
Unsur-unsur Tabung, Kerucut dan Bola

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