Line DE is a tangent line to the circle perpendicular to radius OA.[br][br]What do you notice about [math]\angle DAB[/math] and [math]\angle BCA[/math]?[br]Move around the points B and C to confirm this relationship?[br][br]What can you infer about the relationship between [math]\angle ABC[/math] and [math]\angle EAC[/math]?[br]Mark the checkbox to confirm the relationship between the two angles.[br][br]How would you describe the location of these angles relative to one another?