
MATEMATIKA
Presentation
•
Mathematics
•
6th Grade
•
Hard
Nanik Sudarni
FREE Resource
5 Slides • 1 Question
1
MATEMATIKA
By Nanik Sudarni
2
LUAS PERMUKAAN GABUNGAN BANGUN RUANG
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Meli dan Siti akan membuat kerajinan dari flannel.
Perhatikan Gambar 3.33 di atas. Diameter ice cream
tersebut 7 cm. Panjang garis tepi cone 15 cm. Berapa cm2
kain flannel yang dibutuhkan?
Coba tulis ulang bacaan di atas! Gunakan kalimatmu
sendiri! Kerjakan di buku tulismu dengan rapi!
3
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Ice cream terdiri atas dua bangun ruang yang digabung
menjadi satu. Bagian ice cream berbentuk setengah bola.
Bangian cone berbentuk kerucut. Dari bacaan di atas dapat
diketahui sebagai berikut. Panjang diameter ice cream 7
cm dan garis tepi cone 15 cm. Artinya panjang diameter
bola dan kerucut 7 cm. Panjang garis pelukis kerucut 15 cm
4
Luas permukaan ice cream sama dengan luas
permukaan setengah bola. Jika dihitung hasilnya
adalah
L = x 4 πr²
= 2πr²
= 2 x 22
7 x 72 cm x 27 cm
= 2 x 22 x 7 x 7
7 x 2 x 2 cm²
= 77 cm²
Luas permukaan cone sama dengan luas permukaan
selimut tabung
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5
Ls = π r s
= 22
7 x 27 x 15
= 22 x 7 x 15
7 x 2
= 165
Luas permukaan bangun adalah jumlah dari luassetengah lingkaran dan luas selimut kerucut. Hasilnya adalah
L = 77 cm² + 165 cm²
= 242 cm²
Jadi, luas kain flannel yang dibutuhkan adalah 242 cm².
Subject | Subject
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6
Open Ended
Tentukan luas permukaan bangun berkkut ini !
MATEMATIKA
By Nanik Sudarni
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