hitunglah volume suatu bola yang luas permukaannya adalah 1256 cm²

Luas permukaan bola : 4 × phi × r^2
@ 1256 = 4 × 3,14 × r^2
@ 1256 = 12,56 × r^2
@ r^2 = 1256/12,56
@ r^2 = 100
@ r = 10 cm

Volume bola = 4/3 × phi × r^3
@ V = 4/3 × 3,14 × (10)^3
@ V = 4/3 × 3140
@ V = 4.186,66 cm^3

Semoga membantu.. ^_^

LP = 4 [tex] \pi [/tex] [tex] r^{2} [/tex]
1256 = 4 x 3,14 x [tex] r^{2} [/tex]

1256 = 12,56 x [tex] r^{2} [/tex]
100 = [tex] r^{2} [/tex]
10 = r

V = [tex] \frac{4}{3} x \pi x r^{3} [/tex]
   = [tex] \frac{4}{3} [/tex] x 3,14 x [tex] 10^{3} [/tex]
   = [tex] \frac{4}{3} [/tex] x 3.140
   = 4.186,67
   = 4.187 [tex] cm^{3} [/tex]

maaf kalau salah