Kunci Jawaban Matematika Kelas 9 Halaman 280 281 282 283, Hitung Luas Volume Bangun Tabung jenjang SMP/MTs

a) Luas = (2π x 4 x 4) + (2π x 4 x 10)
= 32π + 80π
= 112π cm^2;
Volume = π x 4 x 4 x 10
= 160π cm^3;

Baca Juga: Kunci Jawaban Bahasa Indonesia Kelas 9 Halaman 144 145 Kegiatan Literasi Membaca Buku

b) Luas = (2π x 7 x 7) + (2π x 7 x 6)
= 98π + 84π
= 182π cm^2;
Volume = π x 7 x 7 x 6
= 294π cm^3;

c) Luas = (2π x 4 x 4) + (2π x 4 x 12)
= 32π + 96π
= 128π cm^2;
Volume = π x 4 x 4 x 12
= 192π cm^3;

d) Luas = (2π x 1 x 1) + (2π x 1 x 8)
= 2π + 16π
= 18π m^2;
Volume = π x 1 x 1 x 8
= 8π m^3;

e) Luas = (2π x 2 x 2) + (2π x 2 x 10)
= 8π + 40π
= 48π m^2;
Volume = π x 2 x 2 x 10
= 40π m^3;

f ) Luas = (2π x 3,5 x 3,5) + (2π x 3,5 x 20)
= 24,5π + 140π
= 164,5π cm^2;
Volume = π x 3,5 x 3,5 x 20
= 245π cm^3;

Soal 2. Tentukan panjang dari unsur tabung yang ditanyakan.

a) V = π x r x r x t
600π = π x 10 x 10 x t
t = 600π / 100π
t = 6 cm

b) L = 2π x r x (r + t)
120π = 2π x 5 x (5 + t)
5 + t = 120π / 10π
5 + t = 12
t = 7 cm