location of tetrahedral voids in hexagonal?(i am unable to see all the voids in detail)

When a third layer is placed over the second layer in such a way that spheres cover the octahedral or ‘c’ voids, a layer different from layers A and B is produced. Let it be layer ‘C’. Continuing further a packing is obtained where the spheres in every fourth layer will be vertically aligned to the spheres present in the first layer.This pattern of stacking spheres is called ABCABC ……….. pattern orcubic close packing (ccp). It is similar to face centred cubic (fcc) packing as it has cubic symmetry.

Wherever a sphere of the second layer isabove the void of the first layer (or vice versa) a tetrahedral void is formed

When the triangular voids in the second layer are abovethe triangular voids in the first layer, and the triangular shapes of thesedo not overlap an octahedral void is formed.