Pe o foaie de matematica in forma de patrat sunt 256 de patratele , fiecare patratel avand latura de 0,5 cm. Aflati cati centimetri are o latura a foii de matematica.

It would be better if you translate in English.

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)

a

step-by-step explanation:

a