A hexagonal pyramid first placed in such a way its axis is perpendicular to V.P and one edge AB parallel to H.P and then next this is turned about its axis so the base AB is now making some angle with H.P. The top view for previous and later one will be having different shapes.

Projection of Solids topics include: Solids basics, solids projection with axis inclined and spheres projection.

A solid is an object with three dimensions: length, breadth, and height or thickness. To represent a solid in orthographic projection, at least two views are needed:
Front view: Represents length and height
Top view: Represents length and breadth 

The projection of a solid on the plane to which its axis is perpendicular will show the true shape and size of its base.

Related: Engineering Drawing Practice Test: Projection of Planes