In the given ⊙C, the central angle is shown.[br]Grab Point E and move to Point A.[br]The new ∠DEB in an inscribed angle.[br]The inscribed ∠ is half of the central ∠.[br]You can move Points B and D show [br]more about other inscribed ∠s.

Add a new Point F on the circle.[br]Create segments FB and FD.[br]What conjecture can you make[br]about the measure of ∠DFB?