Make another construction by following these steps:
Create a random point D on circle AC.
Construct the radii 
 AC and AD
Determine the intersection of  AC
 with circle AB, and label this point E.
Determine the intersection of  AD
 with circle AB, and label this point F.
 Record the coordinates of points E and F on circle AB.
                                             
                                          
                                          
                                       