Instructions:[br]In the diagram, [i]O[/i] is the centre of the circle and [i]PR[/i] is the diameter. [br]Angle [i]PQR[/i] is subtended by the diameter [i]PR[/i].[br]Move point [i]Q [/i]around to observe how angle [i]PQR[/i] changes.
Since [i]PR[/i] is the diameter, what is the figure [i]PORQ [/i]called?