DSE Circle-ACT05A Exterior Angle of a Cyclic Quadrilateral

1. You can change the cyclic quadrilateral [i]ABCD [/i]by moving the points [i]A[/i], [i]B[/i], [i]C [/i]and [i]D[/i].[br]2. Where is [math]\theta[/math] in this figure? Try to describe [math]\theta[/math] in different ways.[br]3. How to find [math]\theta[/math] quickly?
– MrWat@SFCC(HK)

Information: DSE Circle-ACT05A Exterior Angle of a Cyclic Quadrilateral