
LUAS PERMUKAAN TABUNG
Presentation
•
Mathematics
•
9th Grade
•
Medium
ernawati spd
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8 Slides • 3 Questions
1
BANGUN RUANG SISI LENGKUNG
Kelas/ Semester : IX/ Genap
SMP N 1 PADANGRATU
LAMTENG
By ernawati spd
2
TABUNG
By ernawati spd
( LUAS PERMUKAAN TABUNG )
3
Luas alas tabung = Luas tutup = Luas Lingkaran
Luas selimut Tabung = Luas persegi panjang = panjang x lebar
Some text here about the topic of discussion.
LUAS PERMUKAAN TABUNG
4
Luas Selimut Tabung = Luas Persegi Panjang
= Panjang x lebar
= Keliling Lingkaran x Tinggi Tabung
= 2π r x t
= 2π r t
Luas Alas Tabung = Luas Tutup = Luas Lingkaran = π r2 t
5
Maka, Luas Permukaan Tabung dapat ditentukan dengan menjumlahkan seluruh bagian tabung.
Luas Permukaan Tabung = Luas alas + Luas Selimut + Luas Tutup
= π r² + 2π r t + π r²
= 2π r² + 2π r t
= 2π r ( r + t )
Subject | Subject
Some text here about the topic of discussion
6
KETERANGAN :
L = Luas Permukaan
r = Jari - Jari
t = Tinggi
Some text here about the topic of discussion.
L = 2π r ( r + t )
7
Contoh :
Sebuah tabung berjari-jari 5 cm. Jika tingginya 5 cm dan π = 3,14, hitunglah luas permukaannya.
Penyelesaian:
Gunakan rumus:
L. tabung = 2πr(r + t)
L. tabung = 2 . 3,14 . 5 cm . (5 cm + 5 cm)
L. tabung = 2 . 3,14 . 5 cm . 10 cm
L. tabung = 314 cm2
Jadi, luas permukaan tabung adalah 314 cm2.
8
Multiple Choice
Rumus Luas selimut tabung yang benar adalah ....
2πrt
2πr (r + t)
2πr2
2πr2t
9
Multiple Choice
Jika sebuah tabung berjari-jari 7 cm dan memiliki luas permukaan 748 cm2, maka tinggi tabung tersebut adalah .... cm
20
15
10
5
10
Fill in the Blanks
Type answer...
11
TERIMA KASIH ......
BANGUN RUANG SISI LENGKUNG
Kelas/ Semester : IX/ Genap
SMP N 1 PADANGRATU
LAMTENG
By ernawati spd
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