KUNCI JAWABAN Matematika Kelas 9 SMP Halaman 307 Uji Kompetensi 5, Bangun Ruang Sisi Lengkung

g) Luas = 4 x π x 12 x 12
= 576π cm2

h) Luas = 4 x π x 5 x 5
= 100π m2

i) Luas = 4 x π x 8 x 8
= 256π dm2

j) Luas = 2 x π x 6 x (6 + 9)
= 180π m2

k) Luas = π x 6 x (6 + 3√13)
= (36 + 18√13)π dm2

l) Luas = 4 x π x 8 x 8
= 256π cm2

2. Tentukan volume tiap-tiap bangun.

Jawaban:

a) Volume = π x 5 x 5 x 14
= 350π cm3

b) Volume = π x 12 x 12 x 40
= 5760π dm3

c) Volume = π x 1 x 1 x 2
= 2π m3

d) Volume = 1/3 x π x 9 x 9 x 12
= 324π cm3

e) Volume = 1/3 x π x 8 x 8 x 15
= 320π dm3

f) Volume = 1/3 x π x 1 x 1 x √3
= √3/3π m3

g) Volume = 4/3 x π x 12 x 12 x 12
= 2304π cm3