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25 Contoh Soal Tabung, Kerucut, dan Bola - Rikhania Digital

25 Contoh Soal Tabung, Kerucut, dan Bola

25 pertanyaan dalam artikel ini

Geometri
Pertanyaan

Sebuah wadah berbentuk tabung mempunyai jari-jari 7 cm dan tinggi 10 cm. Wadah tersebut akan diisi air hingga penuh. Berapa banyak air yang dapat ditampung dalam wadah tersebut dalam satuan liter?

💬 Jawaban

Wadah tersebut dapat menampung 1,54 liter air.

📖 Penjelasan

Pertama hitung volume tabung:

V = π × r² × t

Diketahui:

r = 7 cm
t = 10 cm
π = 22/7

Maka:

V = 22/7 × 7 × 7 × 10

Sederhanakan:

V = 22 × 7 × 10
22 × 7 = 154
154 × 10 = 1.540

Jadi volume wadah:

V = 1.540 cm³

Selanjutnya ubah cm³ menjadi liter.

Diketahui:

1 liter = 1.000 cm³

Maka:

1.540 ÷ 1.000 = 1,54

Jadi:

1.540 cm³ = 1,54 liter

Dengan demikian, wadah tersebut dapat menampung 1,54 liter air.

💡 Tips

  1. Hitung volume wadah terlebih dahulu dalam cm³.
  2. Jangan langsung mengubah satuan sebelum mendapatkan volume.
  3. Ingat bahwa 1 liter = 1.000 cm³.
  4. Untuk mengubah cm³ menjadi liter, bagi dengan 1.000.
  5. Jika mengubah liter menjadi cm³, lakukan kebalikannya, yaitu dikalikan 1.000.
  6. Periksa kembali hasil pembagian dengan mengalikan 1,54 × 1.000 = 1.540.

📝 Catatan

Konversi satuan sangat penting dalam soal kehidupan sehari-hari. Jika sebuah wadah mempunyai kapasitas 1.540 cm³, kapasitas tersebut tidak berarti 1.540 liter. Karena 1 liter sama dengan 1.000 cm³, kapasitasnya hanya 1,54 liter. Kesalahan paling umum adalah lupa melakukan konversi satuan pada hasil akhir.