Rotational Tesselation (WPG "p2")

1. Move the Green slider and it will rotate the quadrilateral about the mid-points of its edges -> tesselation of ANY quadrilateral. [Move Blue points to change the quadrilateral]. 2. Move the Red points to create cut-outs, Geogebra will automatically create the required piece to fit. 2a. How are the additional and cut pieces related?