Jawab:

7. 12 cm

8. 10,5cm

9. 11.498,667 cm³

Penjelasan dengan langkah-langkah:

7. Volume setengah bola padat 3.617,28cm²

V = (1/2) x (4/3) x π x r^3

V = (4/6) x π x r^3

V = (2/3) x π x r^3

r^3 = V/[(2/3) x π]

r^3 = 3.617,28/[(2/3) x (3,14)]

r^3 = 3.617,28/[6,28/3]

r^3 = 3.617,28 x [3/6,28]

r^3 = 10.851,84/6,28

r^3 = 1.728

r = ^3√(1.728)

r = 12 cm

8. Volume bola = 4851 cm3

4/3 * 22/7  * r^3 = 4851

r^3 = 4851*3*7/(4*22)

r^3 = 1157,625

r = 10,5 cm

9. V = 4/3 × π × r³

   = 4/3 × 22/7 × 14³

   = 4/3 × 22/7 × 2.744

   = 4/3 × 22 × 392

   = 4/3 × 8.624

   = 34.496/3

   = 11.498,667 cm³