The points of quadrilateral ABCD all lie on the circumference of a circle. Quadrilaterals with this property are called [i]cyclic quadrilaterals[/i].[br][br]Move around points A, B, C and D.[br][br]What do you notice about [math]\angle DAB[/math] and [math]\angle BCD[/math]?[br][br]Given what you know about quadrilaterals, what can you infer about the relationship between [math]\angle ABC[/math] and [math]\angle CDA[/math]?[br]Mark the checkbox and mover around the points to confirm the relationship.[br][br]