1. There are 24 rhombi in the tessellation. Of these, 8 are squares and 16 have 45° acute angles and 135° obtuse angles. The center of the tessellation is a star-shaped figure made of 8 of the acute rhombi; the border is formed from 8 of this same shape.

2. 60 rhombi

3. 30° and 150°

Solution