Gillian was also exploring angles between two parallel lines. She created the applet below.
Gillian says that [math]\angle CDB[/math] is always equal to [math]\angle EDF[/math].
Do you agree with Gillian?
James thinks that some other angles are also equal to [math]\angle CDB[/math].
Which other angles are also always equal to [math]\angle CDB[/math]?