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For the same long diagonal length of indenter of Vickers hardness and Knoop hardness, the Knoop hardness is how much percentage of the Vickers indenter?

For the same long diagonal length of indenter of Vickers hardness and Knoop hardness, the Knoop hardness is how much percentage of the Vickers indenter? Correct Answer 15 %

The following figures show that the primary length of the diagonal is the same. But the Knoop indenter has minor diameter 1/7 of the primary diameter, so the area will be only 15% of the Vickers indenter.

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