Brinell hardness number is equal to: (a) (frac{P}{D-sqrt{D^{2}-d^{2}}}) (b) (frac{P}{Dleft[D-sqrt{D^{2}-d^{2}} ight]}) (c) (frac{2 P}{D-sqrt{D^{2}-d^{2}}}) (d) (frac{2 P}{pi

Brinell hardness number is equal to:

(a) \(\frac{P}{D-\sqrt{D^{2}-d^{2}}}\)

(b) \(\frac{P}{D\left[D-\sqrt{D^{2}-d^{2}}\right]}\)

(c) \(\frac{2 P}{D-\sqrt{D^{2}-d^{2}}}\)

(d) \(\frac{2 P}{\pi D\left[D-\sqrt{D^{2}-d^{2}}\right]}\)