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Ina hardness test, L is load in kg, D is diameter of ball in mm and d is diameter of indentation in mm. Brinell Hardness Numberis expressed by the equation
$$BHN = \frac {L}{\pi D(D - \sqrt{D^2 - d^2})}$$
$$BHN = \frac {2L}{\pi D(D - \sqrt{D^2 - d^2})}$$
$$BHN = \frac {L}{\pi d(D - \sqrt{D^2 - d^2})}$$
$$BHN = \frac {2L}{\pi d(D - \sqrt{D^2 - d^2})}$$
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