Kunci Jawaban Matematika Kelas 9 Halaman 280, Rumus Luas Selimut Tabung, Volume, Rusuk Ada Berapa?

Volume tabung = π x r x r x t

a) Luas = (2π x 4 x 4) + (2π x 4 x 10)

= 32π + 80π

= 112π cm2;

Volume = π x 4 x 4 x 10

= 160π cm3;

b) Luas = (2π x 7 x 7) + (2π x 7 x 6)

= 98π + 84π

= 182π cm2;

Volume = π x 7 x 7 x 6

= 294π cm3;

c) Luas = (2π x 4 x 4) + (2π x 4 x 12)

= 32π + 96π

= 128π cm2;

Volume = π x 4 x 4 x 12