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Nakita,id - Rumus Matematika Bangun Ruang Sisi Lengkung dijelaskan pada materi belajar dari rumah TVRI untuk siswa SMP apda Kamis 30 April 2020.
Melalui tayangan Matermatika Manfaat Betul, diterangkan bangun ruang sisi lengkung adalah bangun ruang yang memiliki selimut dan memiliki bagian-bagian yang berupa lengkungan.
Contoh bangun ruang sisi lengkung antara lain tabung, kerucut, dan bola.
Adapun beberapa simbol yang harus diketahui di dalam bangun ruang sisi lengkung, yaitu:
La = Luas alas
t = Tinggi
r = jari – jari lingkaran
π = terdiri dari 22/7 dan 3,14
S = garis lukis
Berikut ini adalah rumus matematika bangun ruang sisi lengkung:
1. Rumus Tabung
a. Luas alas atau tutup tabung = πr²
b. Luas tabung tertutup / Permukaan = ( ka x t ) + ( 2 x La )
= ( 2rt ) + ( 2 )
= 2 ( t + r )
c. Luas tabung tanpa tutup = ( ka x t ) + La
= 2rt +
= r ( 2t + r )
d. Volume tabung = La x t
= πr²t
e. Luas selimut tabung = ka x t
= 2 πrt
2. Rumus Kerucut
Volume kerucut = 1/3 x La x t
= 1/3 x πr² x t
= 1/3 πr² t
Luas selimut kerucut = 2πr / 2πs x πs2
= πrs
Luas sisi kerucut = πrs + πr²
= π r ( s + r )
Hubungan s, r , dan t pada kerucut :
s2 = r2 + t2
t2 = s2 – r2
r2 = s2 – t2
3. Rumus Bola
Luas Bola = 4 πr²
Luas bola benda berongga = 2πr²
Luas bola benda padat / pejal = 3πr²
Volume bola = 1/3 La x t
= 1/3 x 4πr²x r
=4/3 πtr3
Itulah tadi rumus matematika bangun ruang sisi lengkung dan ringkasan materi belajar dari rumah TVRI jenjang SMP pada Kamis 30 April 2020.
Source | : | Gridkids.id |
Penulis | : | Nita Febriani |
Editor | : | Nita Febriani |
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