

Contoh Soal Bangun Ruang
Presentation
•
Mathematics
•
8th Grade
•
Hard
Titi Jelita
Used 2+ times
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5 Slides • 0 Questions
1
Contoh Soal Bangun Ruang
1. Sebuah wadah air berbentuk balok memiliki panjang 20 cm dan lebar 10 cm. diidi air sebanyak 6 liter. tentukan tinggi air dalam wadah tersebut!
jawab
vol = p x l x t
6 liter = 20 x 10 x t
6000 cm3 = 200 t
t = 6000/200
t = 30 cm

2
2. Sebuah balok memiiki luas 340 cm2. Jika panjnag balok 5 cm dan lebar 8 cm. tentukan tinggi balok tersebut!
Jawab
Luas = 2 (p x l) + 2 (p x t) + 2 (l x t)
340 = 2 (5 x 8) + 2 (5 x t) + 2 (8 x t)
340 = 2 (40) + 2 (5t) + 2 (8t)
340 = 80 + 10t + 16t
340 = 80 + 26t
340 - 80 = 26t
260 = 26t
t = 260/26
t = 10 cm
3
3. Sebuah kubus memiliki volum 216 cm cm2 . tentukan luas kubus tersebut!
jawab
Volum = s3
216 = s3
s = 3216
s = 6
Luas = 6s2
= 6. 62
= 6. 36
= 216 cm2
4
4. Sebuah limas persegi memiliki panjang sisi alas 6 cm. jika tinggi limas adalah 4 cm. Tentukan luas dan volum limas tersebut!
jawab
cari tinggi sisi tegak menggunakan dalil phitagoras
t = 32+42
t = 9+16
t = 25
t = 5
L = Luas alas + 4 (Luas sisi Tegak)
= s x s + 4 (1/2 alas x tinggi)
= 6 x 6 + 4 (1/2 . 6 x 5 )
= 96 cm2
Voum = 1/3 x luas alas x tinggi
= 1/3 x s x s x t
= 1/3 x 6 x 6 x 4
= 1/3 x 144
= 48 cm3
5
5. Sebuah prisma segitiga memiliki ukuran 6 cm dan 8 cm. jika tinggi prisma 20 cm. tentukan luas dan volum prisma tersebut!
jawab
sisi miring pada alas prisma cari menggunakan dalil phitagras
s = 62+82
s = 36 + 64
s = 100
s = 10
L = 2 x luas alas + keliling alas x tinggi ptisma
= 2 x (1/2 x alas x tinggi) x tinggi prisma
= 2 x (1/2 x 6 x 8) x (6 + 8 + 10) x 20
= 2 x (24) + (24) x 20
= 48 + 480
= 528 cm2
Vol = Luas alas x tinggi
= (1/2 x alas x t) x t prisma
= (1/2 x 6 x 8) x 20
= 24 x 20
= 480 cm3
Contoh Soal Bangun Ruang
1. Sebuah wadah air berbentuk balok memiliki panjang 20 cm dan lebar 10 cm. diidi air sebanyak 6 liter. tentukan tinggi air dalam wadah tersebut!
jawab
vol = p x l x t
6 liter = 20 x 10 x t
6000 cm3 = 200 t
t = 6000/200
t = 30 cm

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