1. Move points [i]A[/i] and [i]B[/i] to adjust the length and position of the chord [i]AB [/i]in circle. Move point [i]D[/i] to obtain different sizes of [math]\angle[/math][i]ODA[/i]. What is your observation?[br]2. Draw 2 different sets of figures to support your observation.[br][br][br]