Objętość kuli jest równa Pi/6 dm3. Oblicz pole powierzchni tej kuli. ;)
V = 4/3 * Pi * r^3
Pi / 6 = 4/3 * Pi * r^3-----------/ * 6
Pi = 8 * Pi * r^3
1 = 8 * r^3
1/8 = r^3
r = 1/2 dm -----tyle dm ma promień
P = 4 * Pi * r^2 = 4 * Pi * 1/4 = Pi dm^2 -----odpowiedź
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V = 4/3 * Pi * r^3
Pi / 6 = 4/3 * Pi * r^3-----------/ * 6
Pi = 8 * Pi * r^3
1 = 8 * r^3
1/8 = r^3
r = 1/2 dm -----tyle dm ma promień
P = 4 * Pi * r^2 = 4 * Pi * 1/4 = Pi dm^2 -----odpowiedź