Page 54 - Ebook Interaktif Kelas V dan VI Bangun Ruang

7. Jawab B
diameter (d) = 14 cm
jari-jari (r) =1/2 x diameter = 1/2 x 14 = 7 cm
tinggi (t) = 24 cm
Volume Kerucut = 1/3 × Luas alas x t
Volume Kerucut = 1/3 × π x r x t 24 cm
2
2
Volume Kerucut = 1/3 × 22/7 x 7 x 24
7
Volume Kerucut = 1/3 × 22/7 x 49 x 24 8
Volume Kerucut = 1 x 22 x 7 x 8 14 cm

Volume Kerucut = 1.232 cm³

8. Jawab C
2
176 r = 4928 x 7
Volume Kerucut = 4928 cm³ 176 r = 34.496
2
2
Tinggi (t) = 24 cm r = 34.496 / 176
r = 196
2
Volume Kerucut = 1/3 x π x r x t r = 14 cm
2
diameter = 2 x jari-jari
4928 = 1/3 x 22/7 x r x 24 8 diameter = 2 x 14
2
2
4928 = 1 x 22/7 x r x 8 diameter = 28 cm
4928 = 176 r 2
7
9. Jawab D
Bangun ruang gabungan tersebut terdiri dari : Kerucut dan Tabung
Menghitung Volume Kerucut

tinggi kerucut (t) = 6 cm
jari-jari kerucut = jari-jari tabung= 1/2 x diameter tabung
= 1/2 x 14 = 7 cm
Volume Kerucut = 1/3 × π x r x t
2
2
Volume Kerucut = 1/3 × 22/7 x 7 x 6 = 308 cm 3

Menghitung Volume Tabung

tinggi tabung (t) = 12 cm
jari-jari tabung = 1/2 x diameter = 1/2 x 14 = 7 cm

Volume Tabung = π x r x t
2
Volume Tabung = 22/7 x 7 x 12 = 1.848 cm 3
2

Menghitung Volume Gabungan
Volume Gabungan = Volume Kerucut + Volume Tabung

3
Volume Gabungan = 308 cm + 1.848 cm 3
Volume Gabungan = 2.156 cm 3

Jenius Matematika 49