Doubt from solid states

distance between tetrahderal voids and corner is \sqrt{3} a/4 im not able to deive help me

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nvm got it

See diagram given in ncert if you are still confused

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image
explain the first part im getting 8 but 9 is actual answer

Jee 2k16 que
In ccp cn is 12, 6 from same layer and 3 each from top and bottom layer

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It should be 9.Not 12 I did the same mistake.They are asking for top layer

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but here ccp means fcc no why hcp