10.4 Tangents from External Point[br]If two tangents are drawn from an external point to a circle, then[br][list][br][*]the lengths of the tangents are equal,[br]the line joining the external point and the centre of the circle bisects the angle between the tangents.[br][/list][br](tangents from ext. point)

1. Click and drag point A. [br] What do you observe about the lengths AB and AC?[br] What do you observe about the angles OAC and OAB?[br] What do you observe about the angles AOC and AOB?