Jawaban:

1. - Rumus luas permukaan bola: 4 × π × r² • 4 × 22/7 × 7 × 7 = 4 × 22 × 1 × 7 = 616 cm²

• 4 × 22/7 × 14 × 14 = 4 × 22 × 2 × 14 = 2.464 cm²

• 4 × 3,14 × 20 × 20 = 4 × 3,14 × 400 = 5.024 cm²

• 4 × 3,14 × 9 × 9 = 4 × 3,14 × 81 = 1.017,36 cm²

• 4 × 3,14 × 12 × 12 = 4 × 3,14 × 144 = 1.808,64 cm²

- Rumus volume bola : 4/3 × π × r³

• 4/3 × 22/7 × 7³ = 4/3 × 22/7 × 343 = 1.437,3 cm³

• 4/3 × 22/7 × 14³ = 4/3 × 22 × 2 × 14² = 11.498,7 cm³

• 4/3 × 3,14 × 20³ = 4/3 × 3,14 × 8000 cm³ = 4/3 × 25.120 cm³ = 33.493,6 cm³

• 4/3 × 3,14 × 9³ = 4/3 × 3,14 × 729 cm³ = 4 × 3,14 × 243 cm³ = 3.052,08 dm³

• 4/3 × 3,14 × 12³ = 4/3 × 3,14 × 1.728 cm³ = 7.234,56 cm³

2. a. Rumus luas permukaan bumi/bola : 4 × π × r²

4 × 22/7 × 6.370² = 510109600 km²

4/4 - 3/4 air = 1/4 daratan

b. 1/4 × 510109600 = 127527400 km²

Penjelasan dengan langkah-langkah:

Semoga bermanfaat dan membantu