[b]Red dot P for adjusting the length of OP:[/b][br]1. [br][br][b][/b]Pre-requisite knowledge and terms:[b][/b] Perpendicular bisector, Chord[br][br][b][/b]Task:[b][/b] Manipulate the given applet. [br]What is the measure of angle OPA for the lengths AP and PB to be equal?[br]Can you get AP = PB when angle is 60 degrees?